That's really weird! :D

I would probably see a lot if my friends got their way! (cough hemp cough*) I don't use that stuff cause I value my mind and body too much.

I have had ghost sightings, like once I was home alone and I was going to take a shower so all the lights were off, except for the one in the bathroom.

I swear I saw a shadow running through the dark living room.

I just tried to ignore it and went to take a shower.

Later, while the water was running I thought I heard voices or a voice. But I told myself it was just a hallucination and don't like to think much about it.

I drank two 2-Liter bottles of Mountain Dew every day for 6 months once. When I quit cold turkey, I kept seeing Klingons stepping out of walls.

Yes I have. And never again do I want to repeat that experience. Let's just say I was herbally medicated. At a relative's wedding. And too much of a good thing (or should I say bad thing?) led to a very freaky wedding experience where the whole wedding turned into a rock video.

I'm sure my eyes were wide and freaked out through the whole service. Thank god I kept quiet and still (it's all I could focus on: "Just don't move, it's almost over"). Lots of swirling colors, lots of dancers that weren't really there up at the altar. It was even an audio hallucination, there were way more instruments that the church organ playing!

Never again, my friends. Never again.

Pst, Marijuana doesn't cause hallucinations well at least for most people :P Shrooms, Acid and Wormwood do however, wormwood only on occasion. Being that I've tried all three (wormwood being the only one I found enjoyable) I have had hallucinations. I'd equate them to dreaming while awake. Things going on in parts of the brain become projected on to reality.

For instance once outside on a cold Alaska night I saw the stars come down for the sky and become a wolf, they ate a rabbit I was watching. Probably because I was thinking about wolves because I saw one of their main food sources so out in the open...

Oddly enough, Neocitran gives me hallucinations. It IS one of the effects of overdose, but I get hallucinations after even 1/2 or 1/3 of a packet when normal dose is up to 2 packets. I must be allergic to that stuff or something - I get headaches, hallucination, and shakes all over.
The hallucinations are never nice ones - they're always odd thing, like flying heads or random disjointed shapes and colors. Sometimes they're a little scary (monsters) but at least I know where they're coming from. I keep forgetting and just take it when I'm feeling rough, but I need to stop - it always makes me feel disgusting. It's really more of an annoyance than anything as it usually keeps me awake as well.
I also get the odd hallucination from migraines. I suffer from frequent migraines - most aren't bad, but the particularly bad ones come with an "aura".. it's not so much a vision, but random sparks of colors. I always see lines traveling down anything patterned (pages of type, for example) or sometimes fireworks. My mother gets the same.
If you want to hear about crazy visions, talk to someone who's done Salvia. The only reason I mention it is because it IS legal (at least in Canada) and can be bought at almost any corner store - if it weren't legal I wouldn't talk about it. Though I've never done it myself, many of my friends have, and they've had some crazy descriptions the next day... anything from swimming down the stairs from sharks, the world dissolving into cubes with knives through them, to world war II, living inside Comic books, and carnivals in the heating vent. Absolutely ridiculous stories I've heard.
Enjoy!

I have hallucinated cows in the middle of the road when I've been on really long road trips (18+ hours). It only seems to happen at night. I've driven off the side of the road a few times to avoid them.

I have had an odd experience as a child. I don't think it would be classified as a hallucination, since I believe I was asleep during the time of occurrence, but it was strange nevertheless. As a child I grew up with many cats. One day my grey cat Fritzi went missing and after he had been missing for almost a week I grew very worried that something bad had happened to him. Then one night, about 10 days after he went missing I had this dream that I was asleep in my bedroom with the window open. All of a sudden Fritzi jumped through the window and onto my bed meowing. When I lifted him up, I noticed that his stomach area was cut and I ended up reaching into a gapping hole in his body, feeling his insides. I screamed and dropped him at which point he broke apart at his midsection. this is when I woke up. A few more days passed and one day I remember waking up from an afternoon nap on our couch and overheard my mom and stepdad talking in the next room. My mom had voiced concern over Fritzi being missing for so long and my stepdad told her: "Well to tell you the truth, I didn't want to tell you and Diana (me), but when I was mowing the lawn a week ago I saw something grey laying in the grass. I went over and it was Fritzi...". My cat had been out and about in the fields where farmers worked with their tractors and ended up getting caught in one of the sharp blades used to cut the crop. My stepdad told my mom that Fritzi was cut in half right above the waist and had successfully drug himself back home and passed out in the tall grass in front of our house. When my stepdad found him, Fritzi was still alive, but there was no way he would have lived. My stepdad had tried to pick him up and bring him into the garage, but Fritzi bit his hand hard while in shock and soon thereafter he died. Listening to his story, I remembered the day that my stepdad had cut the grass and asked me to bring him a bandage. He had lied and told me at the time that he had cut his hand on the lawn mower. Thinking back, it seemed that I had my dream around the same time that my stepdad had found my cat in the grass.