We had that show here as well. I loved it. It was funny, clean humor without hurting someone. Because I saw this on Youtube, there were of course other practical jokes on there. Usually between couples and they were so nasty, dangerous and totally disrespectful of the person the joke was on. I didn't laugh once. All I could think was... If that were me, the relationship would be over right then and there. There is funny and there is just plain nasty.
The Floor dropping out would give me a second of shock for sure. I once had an elevator act up for real. It just wouldn't let me out, nothing big and it was a fairly short time. I usually make sure I don't have to go to the bathroom before getting on one now though. Ha ha