I had a hand recently where I flopped quads and the other guy turned a FH.
I had 77 on SB. He had 99 utg. He opened and I flatted. I c/c his cbet. Turn comes the 9. I checked he bet and I raised. He called.
The board at this point is 57792
On the river I shoved. He thought for a long time. I thought he had an overpair.
Instead he had 99, which only loses to what I had.
Instead of instant calling he took his time. I dunno if that makes him really good or too nitty.
(And if the river had been a 9, that woulda been sweet.)