another good time to bluff lies when you are almost posotive no one has a hand.

You: 7d 2h YaY! Big blind
2 other players in the hand

The button called and the small blind called.

Flop: Ah 8c 3s

small blind checks to you

You bet.
Why?

In position after everyone folding if the button had an ace he would have raised ... or not have played a weak ace as for fear of domination

the small blind called and checked to you ... at most was hoping to hit two pair on the flop with k 6 or something