I don't try to pump this hand against an unknown. I probably check/call down unless 2 over cards come on the turn & river (and he keeps betting). [Edit: actually, if it's the first few hands at the table, I call down anyway to learn about the button & get the table to think I'm a turd.] I want to showdown here to learn what the button does & because we have top pair, but I don't want it to be expensive in case button's ahead of us. I'll pump pots when I know more or have a less vulnerable hand.