You know, it's less frustrating when they actually do it well even though they expose it afterwards.
What's worst is when the "magician" couldn't even perform the tricks well, but get all the attention just because he "teaches" the audience how the magic tricks work.
There's a so-called magician in Hong Kong who calls himself a cheating-expert. His name is Andy Kwok. All he does is exposing sleights on TV shows.
There was an episode where he teaches the audience how to shuffle 3 cards between each pair of aces, so that he can get all the aces while dealing.
And what did he do? He shuffle 3 cards between the aces in SLOW MOTION, saying that the audience can see better in that way. Nonetheless, during that whole show, he DID NOT perform this "amazing technique" in full speed.
He can't even do what he teaches!!!
THAT pissed me off the most!