SB is literally raising every other hand, although his usual raise is to $2. Hmm... I wonder what he would raise to $4 with...

Party Poker No-Limit Hold'em, $0.50 BB (6 max, 6 handed) converter

Fnord ($24.50)
UTG ($48.68)
MP ($47.87)
CO ($28.50)
Button ($8.30)
SB ($20.45)

Preflop: Fnord is BB with A, Q.
UTG folds, MP folds, CO folds, Button calls $0.50, SB raises to $4, Fnord calls $3.50, Button folds.

Flop: ($8.50) J, T, 3 (2 players)
SB checks, Fnord checks.

Turn: ($8.50) 2 (2 players)
SB checks, Fnord checks.

River: ($8.50) J (2 players)
SB bets $2, Fnord calls $2.

Final Pot: $12.50

Results in white below:
SB shows Ad 8d (one pair, jacks).
Fnord shows Ac Qh (one pair, jacks).
Outcome: Fnord wins $12.50.