The Zane Archer/Dave Bowman incident prompted a comment from me on the weirdness of players, and how "normal people don't do this kind of thing." The players responded with a theory of their own: that players pull bullshit stunts like that because they're trying to freak out the GM.
This isn't news to us. Several of them have straight out said that their goal is to get me to put my head in my hands in amused exasperation. Which I do, on a fairly regular basis. (Though only while GMing, I'm much more expressive than usual while I'm running the game.) I'm generally more entertained by their antics than annoyed, so things work out fairly well.
But it does strike me as a good theory for handling player weirdness in general. They're out to one-up or freak out tick off the GM, who tends to be fairly invested in the world and the campaign and thus responds when they do something bizarre to it. A bit of (hopefully friendly) competition.