A tip for tipping. Always try to treat your dealer with respect no matter what the mood may be.
It is a good idea when a dealer is looking a little blue and no one at the table is tipping to "start it up" by placing a few small bets for them on your hand. On the average, others will soon follow and the spirit of the table and dealer may cheer up a bit,especially if winning.
Dealers should be our friends, not our enemies.