MP seems to be a rather sane, TAggy regular
I've seen BB 3-bet pre-flop at least twice in the couple orbits or so since I sat.

PokerStars No-Limit Hold'em, $1.00 BB (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

Fnord ($96.50)
SB ($77.70)
BB ($214.45)
UTG ($158.85)
MP ($279.10)
CO ($98.90)

Preflop: Fnord is Button with Q, A.
1 fold, MP raises to $4, 1 fold, Fnord calls $4, 1 fold, BB raises to $20, MP folds, Fnord calls $16.

Flop: ($44.50) 5, 6, 6 (2 players)
BB bets $24

Easy shove? Should I have just stuck it in pre-flop?