My Hobby: Sitting down with grad students and timing how long it takes them to figure out that I'm not actually an expert in their field.
Engineering:
Students: Our big problem is heat dissipation
Me: Have you tried logarithms?
48 seconds
Linguistics:
Me: Ah, so does this Finno-ugric family include, say, Klingon?
63 Seconds
Sociology:
Me: Yeah, my latest work is on ranking people from best to worst.
4 Minutes
Literary Criticism:
Me: You see, the deconstruction is inextricable from not only the text, but also the self.
Eight papers and two books and they haven't caught on.
{{Alt
title text: If you think this is too hard on literary criticism, read the Wikipedia article on deconstruction.}}