...a mis-click?

Full Tilt No-Limit Hold'em, $0.10 BB (9 handed) - Full-Tilt Converter Tool from FlopTurnRiver.com

UTG+1 ($12.40)
Hero (MP1) ($10.25)
MP2 ($9.85)
CO ($16.35)
Button ($20)
BB ($10)
UTG ($19.85)

Preflop: Hero is MP1 with 9, 9
1 fold, Hero raises to $0.40, 1 fold, CO calls $0.40, 3 folds

Flop: ($0.95) 8, 9, 2 (2 players)
Hero checks, CO bets $0.80, Hero folds

Total pot: $0.95 | Rake: $0.05

His flop bet-sizing tells me he's probably paying me off too...