Penn & Teller have a show called “Fool Us” where magicians come on and try to do a magic trick that Penn & Teller can’t figure out. If the magician stumps the duo then the magician gets a spot in P&T’s Vegas show and a trophy that rather appropriately looks to say “FU” until you get close.
[I’ll mention now that if you want to skip the cheesy magician intro bit at the start and go straight to the trick jump forward about a minute in the videos]
This one (below) is my favorite, because Penn was (or at least pretended to be) absolutely irate. And with good reason. Penn & Teller performed a variation of this very act on the Today Show the previous week, and they still couldn’t figure out how this one worked.
Kimlat came back in a later season and demonstrated how to technically lose but still win.