I underbetting:

Full Tilt Poker
No Limit Holdem Ring game
Blinds: $1/$2
6 players
Converter

Stack sizes:
UTG: $326.65
UTG+1: $261.45
Hero: $250.80
Button: $179.80
SB: $193
BB: $401.35

Pre-flop: (6 players) Hero is CO with J A
2 folds, Hero raises to $7, Button calls, 2 folds.

Flop: Q T K ($17, 2 players)
Hero bets $10, Button calls.

Turn: 9 ($37, 2 players)
Hero bets $25, Button calls.

River: 2 ($87, 2 players)
Hero bets $75, Button raises all-in $137.8, Hero calls.

Results:
Final pot: $362.6
Hero showed Jc As
Button showed Js Jh