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On the math side, so far, I've thrown up on a slide (i) the 'proof' that ##a=2a##, (ii) ##\cos(x)-x=0, ~x=?##, and (iii) ##\lim_{n \rightarrow \infty} {\cos(x) =?}##. They loved them.

I'm looking for more math or physics teasers like these. I'd appreciate any suggestions.