Blinds are 100/300
4 players remaining with chip stacks all around 2500-3500 (I'm big stack)

BTN open-limps, I have QTs in the SB and complete, BB checks.

Flop:

I check intending on raising any bet all-in. BB bets out half the pot, BTN folds, I re-raise all-in. BB thinks for about five seconds, then calls with ????

Turn:

Alright!! Two pair! He's drawing only to a...

River:

AGH! He calls my all-in with only two overcards (K-high), and runner runner's a two-pair to beat my two-pair.

Not worst call ever, but pretty bad. Too bad it wasn't quite bad enough for you.

I read somewhere about a guy who check-called the river at like a $10/$20 limit game holding 32o that hit nothing on a 4-low unpaired board. Any hand whatever would beat him, except another 32 for the tie. Not sure where I read that.