Bad player strategy

How does everyone deal with a player who will just call everything, and raise with rubbish. I've seen 2 last week, and have ended up playing junk just to get in the pot with them. I suppose you should be patient, but when you see someone burning through their stack at a rate of knots, do you jump in before it's too late and they're gone?

Actually, I stay away from blokes like that. They bring down the table and if they get hot, they are a wrecking ball. Unless u want to go toe to toe with them and catch them in the wrong position, your odds are you will get on tilt before he does.