That knowing smirk

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It's soooo easy to catch a liar. Throw contrary evidence to the ground and say it's the truth (despite knowing otherwise) and seeing the dumb bastard agree confirms the analysis.

 Never say you've read a book to a bookworm. If he says he's read that book, he has. Be wary of his questions, as he would ask things that he knows about, things he can say are otherwise just to catch you lying.