I don't know that my encounter would count as "experience" but back in college ... I believe it was my freshman year... the residence hall peeps had a hypnotist there for entertainment during Welcome Week. It was one of those things where he would get like 10 or so people on stage, put them to "sleep" and make them do funny things.
I don't remember anything about it except when I "woke up" I felt really tired like I had just slept for a really long time. I don't think he made me do anything too terribly crazy, but from what I heard, he had people acting like chickens and other various animals.