GWIT

acronym: Guess What I'm Thinking.

An unfair and/or impossible task (unless you are Derren Brown).
A riddle that masquerades as sophisticated but which can only be solved by mind-reading.

A (chucklehead: Bet you can't GWIT
B: Yeah, i can't really be bothered.
A: Oh go on, i'm not gonna give you any clues though.
B: Are you enjoying this?
A: Yes
B: I'm not.
A: Go on, GWIT... please.