I'LL BET I CAN. I've discovered Blog of a Math Teacher, where I find a complaint about the absence of proofs in geometry class because "You can't test proofs with a multiple choice test." Oh yeah? Ever hear of the Lobachevsky Postulate? (Presumably these are tests in plane geometry.) Ever rearrange the ratio of line segments in a plausible-looking way that involves dividing by zero? (that's the trick in the old 1=0 proof.) The mind boggles at the possibility of inventing substitutions and postulates that students might inadvertently on purpose bite on. (Regular readers will now understand why I tell my students, "You do NOT want me to give you a multiple choice test.")