First hand at the table. I felt if he had a hand, he'd have raised at some point prior. This smelled to me like a big stack trying to push people around (not to mention that his chat as he pushed read something like "the river man rides again!").

Party Poker No-Limit Hold'em, $ BB (9 handed) converter

SB ($24.45)
BB ($49.1)
UTG ($62.95)
UTG+1 ($131.45)
MP1 ($50)
Hero ($15)
MP3 ($32.35)
CO ($43.25)
Button ($124.25)

Preflop: Hero is MP2 with J, 8. SB posts a blind of $0.25. Hero posts a blind of $0.5.
1 fold, UTG+1 calls $0.50, MP1 calls $0.50, Hero (poster) checks, 2 folds, Button calls $0.50, SB (poster) completes, BB checks.

Flop: ($3) J, 6, T (6 players)
SB checks, BB checks, UTG+1 checks, MP1 checks, Hero bets $2, Button folds, SB folds, BB folds, UTG+1 calls $130.95 (All-In), MP1 folds, Hero calls $12.50 (All-In).

Turn: ($148.45) 3 (2 players, 2 all-in)

River: ($148.45) 7 (2 players, 2 all-in)

Final Pot: $148.45