Originally Posted by Seasider

A 4 generally doesn't push but tries to string you along a bit and trap you. He probably has a weaker ace or pockets. Of course this is 25NL and you see all sorts of stuff, but I call these all night the push means a weaker hand or draw, this recent hand springs to mind (lost but would call them all night also this guy was a shorty so didn't take much balls)....

PokerStars No-Limit Hold'em, $0.50 BB (5 handed) FTR converter on zerodivide.cx

BB ($7.65)
UTG ($50.25)
MP ($42.55)
Hero ($67.75)
SB ($16.60)

Preflop: Hero is Button with K, K.
UTG calls $0.50, MP calls $0.50, Hero raises to $3, SB calls $2.75, 1 fold, UTG folds, MP calls $2.50.

Flop: ($10) T, 9, 9 (3 players)
SB bets $13.6 (All-In), MP folds, Hero calls $13.60.

Turn: ($37.20) 2 (2 players, 1 all-in)

River: ($37.20) 6 (2 players, 1 all-in)

Final Pot: $37.20

Results in white below:
Hero has Kh Kc (two pair, kings and nines).
SB has 8c 7c (flush, nine high).
Outcome: SB wins $37.20.