I've never taken acid but I've done mushrooms several times in my younger days. The experience sounds similar but I'm sure not as intense. Only had one bad trip and it was because we didn't plan things correctly. Had about 7 close friends out on my buddy's farm, it was hot as hell, we all showed up later than we had planned, and we just ate as many shrooms as possible without really knowing how much we each ate. Needless to say, I ate entirely too much, I could not stop sweating, and sat in the living room for at least 2 hrs with a fan three inches from my face. Only redeeming part of that trip was pretending to be Darth Vader every time a buddy walked into the room.
About 6 years ago we got a hold of some "chocolates" and the same group of buddies ate them around 9 o'clock in the evening. My girlfriend (now wife) showed up about 2 hours later and she has no idea of what we have done. At this point nothing is happening and we all get pissed thinking we got screwed buying chocolates. She's already upstairs in bed so I go to meet her in bed. About 20 minutes later it's pitch black in the room and she starts rubbing my head. Her fingers start to melt into my head and I knew immediately I needed to get out of that room. Told her I need a drink, walk downstairs, turn into the living room and all of my buddies are on the couch with their jaws on the floor watching Planet Earth. I stayed with them for the next 3 hrs. Still can't believe she didn't break up with me the next morning.
It can be an absolutely awesome experience when you plan everything correctly.
Used to eat a relatively small amount and roam around Two Keys or house parties. Just laugh and dance all night.
Went to a buddy's farm in southern Ohio that had a very old barn on the property that was in pretty rough shape. It had old straw, rocks, and bricks all around it. Myself and two other people had laterns, went exploring in it, and I legitimately thought I was Indiana Jones.
Seems like a younger man's drug to me. Would love to try it again but the stress of being an adult freaks me out if I ever tried them again. It was a great time though. Just follow the rules in this thread and you should be good.