[JAA]

I would fold preflop. The only time I open raise with a hand like K3s is from the button or CO when everyone left to act behind me is tight.

As for the hand; "what the hell, I cap" is very very bad for you. Almost always means your beat (especially when you're holding top pair no kicker on a monotone flop). I would check the turn, unless you know him well enough that a.) you know he was capable of capping the flop with a hand that you have beat (i.e. middle pair w/ ace of spades) and b.) he is str8forward enough that you could bet and fold to a craze. Barring that, plan to go to showdon as cheaply as possible if you must.

- Jags