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A father and son were playing in the game I was in. The son raised preflop. Several folded to dad who pushes. Son calls with TT. Dad smiles and flips over J3o. Son takes down the pot. Dad winks at son. I say nice chip dump. The dealer and the two culprits ignore it. The guy on my left noticed it too and we griped to each other about it. I wish now that I would have had the game stopped at that point.

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I don't see this as collusion. This could be dad trying to get junior to fold so he can flip over J3 and needle him. If dad had called an all-in with J3, then we have some solid evidence of something rotten. But pushing all-in with crappy cards is more likely a bluff gone wrong.