Currently cursing:

IS-LM model. Not fun.

Mathematics

My two favorite math jokes:

A mathematician walks into a bar and asks for ten times the normal number of drinks anyone else has. “Wow,” says the barkeep, “That’s an order of magnitude.”
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“What do you do with that math degree?” “I use it to park my SUV. You see, if I roll up the windows, then the SUV is a closed and bounded subset of Euclidean space and therefore compact.”