Sitting down at a silent table
Find the table that's making the most noise. Generally, that means people are: a) winning, b) drinking, c) winning and drinking, and d) having a good time. You're there to have a good time, after all, which will be exponentially increased by a table full of people drinking, yelling, and high-fiving each other. Because this correlates strongly with the table winning money. And you like winning money. Once, I got cleaned out at a blackjack table and moved to another with three dudes drinking for a bachelor party -- we played together for nine hours. Granted, I went to work the next morning on no sleep, but I was also $2,000 richer.
Hitting on 16 in Blackjack vs. paint
No, it has nothing to do with the age of consent inside a casino. That's 21 in the US, anyway. But a fair number of people will tell you, "Never hit on 16," when you're against a dealer's face card.
Not hitting on 16 in Blackjack vs. paint
Conversely, plenty of people will tell you the exact opposite -- that you should ALWAYS hit on 16. Well, if the dealer has a 7 or better, you're giving yourself a fighting chance.