Something that makes a character a Jerkass.
Very similar to Berserk Button in which a character becomes angry to the point of resorting to violence. This trope is where a character becomes cruel and callous. Perhaps he lost the game and became a bit of a sore loser. Maybe he's been hanging with the wrong crowd as of late. Perhaps someone should at least mellow him out before he takes his jerkassery to a whole new level. May be the explaination why the character Took a Level in Jerkass. If the character pressed the button on his own without the help of others, then it's Bitch In Sheep's Clothing.
Hello, Unknown Troper. You'll need to get known to lend a hand here.