[jrz1972]

I think a slowplayed overpair is significantly less likely than something that has us beat.

Villain obviously has something that he thinks is really good. Unless he's a total retard, he's not playing this way with A5 or 88. He either has the case J (in which case our hand may or may not be good depending on villain's kicker) or he has 55, or he has an overpair. At least in my experience, against the typical unknown at this level the order of likelihood is probably

1. Some J
2. 55
(dropoff)
3. Big overpair