jokes about economists

i had a dream yesterday during the day. in it mary told a joke:

"how do you get an economist to shit in a bag?"

the answer is to tell him to assume it's a toilet but the fact that mary said this was just so funny.

i of course immediately decided to take credit for the not-very funny joke a la michel gondry's egg - it was my dream.

i think the heat must be getting to me.