Ooops, I must not like money

I folded a chop by accident the other night. 20/40 game a couple of limpers, cutoff raises, and I call from the big blind with Qc9c. Flop comes AQJ with 1 club. Checked to the pre-flop raiser who bet, I called, everyone else cleared out. Turn was a low club, and I check/called again. River was a Q. I considered donking, but decided to check and see what he would do and he bet. I considered what hands he would do that with, then considered what hands would call a check/raise, and further considered what hands would 3-bet me if I check-raised, and decided to just call.

He rolled QsTs, and I reflexively mucked my hand, which was good for half the pot . . .