Was this turn call not the most obvious slow-play ever? People can be pretty dumb.

PokerStars No-Limit Hold'em, $2 BB (5 handed) FTR converter on zerodivide.cx

Hero ($371.95)
SB ($283.05)
BB ($330)
UTG ($71.60)
MP ($84.30)


Preflop: Hero is Button with 2, 2.
UTG calls $2, MP raises to $6, Hero calls $6, SB calls $5, BB raises to $24, UTG folds, MP calls $18, Hero calls $18, SB folds.

Flop: ($80) 2, 2, 9 (3 players)
BB bets $56, MP folds, Hero calls $56.

Turn: ($192) 7 (2 players)
BB bets $124, Hero calls $124.

River: ($440) Q (2 players)
BB bets $126 (All-In), Hero calls $126.

Final Pot: $692

Results in white below:
BB has Ac Qc (two pair, queens and twos).
Hero has 2s 2h (four of a kind, twos).
Outcome: Hero wins $692.