I always liked Andre Kole's self levitation. The moment when the lighted proscenium receeds is truly fabulous. I saw this performed in a VERY small college theater and even though I thought I knew some of the work involved, it looked truly impossible.
As for worst levitations, I can offer this story. It may not be the worst, but for at least one person it was certainly the most uncomfortable.
I was working as a stage coordinator of sorts for a magic event in Louisville, Ky. Past IBM President Bob Escher was on the bill, and he asked that I assist with the Asrah. For those that know me, I was to be the other guy drapping the cloth. They don't make cables strong enough for me to apprise the other role.
I was particularly happy about this because Bob happens to own the Asrah table which belonged to Howard Thurston. (I happen to own one of Thurston's forms.)
We rehearsed with his assistant/now wife Sandy. All was well.
The show was another story. You see, the top of the table is disguised with a series of ridges in the elastic. What I didn't realize was that these were actually a series of SEPARATE elastic bands which traversed the table. I just assumed it was a stitching with only one opening to allow passage for the girl. Afterall, that would make sense, no?
I was wrong.
Showtime. Cloth. Bob and I each duck our hands into the table and open the way for Sandy.
Sandy enters the table, and as we cover, she pops up to the top again.
We press down.
(The popping was accompanied by wriggles and exclamations)
Press, pop. Press pop.
Apparently Bob and I had seperated two different strands of elastic and poor Sandy had one of them running down and through her "midline", thereby causing the impression of a rather irritated toaster.
Bob, ever thinking, gave one final press and held Sandy down as he blocked the front of the table with his body and escorted it off stage himself.
I would like to say Sandy made her appearance in the back of the house smoking a cigarette, but the story ends as one would expect. Sandy appeared, the audience applauded, and to this day Bob and I laugh whenever someone mentions the Asrah.