Decider,
for the home game i`d be putting in a penalty for this..its not funny and its not clever either, and if thats what happened then i`d reconsider the people playing in the home game.
As for the river boat yet another example of amatuer night...if there is money on the table then it should be played correctly..if you want to be a comediian do stand up - if you want to play cards then do it right and have a laugh after the hand.
regular or not he should be put straight either by yourself or if you are unsure then the cardroom manager.
its all about respect and doing this is showing major disrespect.

We'll introduce a rule at the home games to settle it. I don't have as much of a problem with the dealer putting the card face down then hesitating before flipping (although it is annoying) but I do get pissed off when others see the card before me. When that happens I always look to the dealer to get an indication of what the card is... then a few second delay before I get shown that I've won/lost.
Looks like everyone that's replied agrees so it should be easy enough to sort out.
Cheers folks,
Eoan