Say you have Q [img]/images/graemlins/spade.gif[/img] K [img]/images/graemlins/spade.gif[/img] in late position

The flop is 3 [img]/images/graemlins/spade.gif[/img] J [img]/images/graemlins/spade.gif[/img] 8 [img]/images/graemlins/heart.gif[/img] and someone bets and there are a couple of callers.

The best hand so far is probably 1 pair so you are behind.

But -

Any spade (9 cards) or non-spade K/Q (4 cards) very probably puts you ahead. And any non-spade A/10 (6 more cards) gives you additional draws. With so many cards you'd be happy to see a raise is worth it.

And, even if you draw a blank you bought a chance of getting to see the river for free, as many players will check to the raiser.