$4k Guaranteed: Weird limp behind, then reraise. Wtf is this?

[JMurder3]

I had almost this exact same thing happen to me the other day...was small blind with JJ, button limped, I raised, he pushed. I thought he was doing this light cuz I'd been fairly aggressive the last few hands (taking them all down, most of em were actually good hands), so I called and he had AQ (I lost of course)...dunno, just a weird play. I think you made the right fold though if he has a tighter image on you...but why limp the button with AA with tight player on BB? Ah well, people are crazy...should I have folded my JJ in similar situation?