QQ gets RE Re Raised 4 to 15 to 50....call?

[HoldenFoldem]

Anybody call this raise?????? It crossed mymind that if he wanted action on a big pair this was not the way to do it. Thoughts.....could he be stealing with AK , or 77 or ???
Party Poker No-Limit Hold'em, $1 BB (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

MP ($108.85)
Hero ($107.53)
Button ($132.68)
SB ($100.55)
BB ($100)
UTG ($23.75)

Preflop: Hero is CO with Q[img]/images/graemlins/heart.gif[/img], Q[img]/images/graemlins/spade.gif[/img].
UTG calls $1, <font color="#CC3333">MP raises to $5</font>, <font color="#CC3333">Hero raises to $15</font>, <font color="#CC3333">Button raises to $50</font>, <font color="#666666">2 folds</font>, UTG folds, MP folds, Hero folds.

Final Pot: $72.50