I don't recall all the details about this hand, but here's what I do know.
Some folds and possibly some limps; I forget exactly.
Villain (Has hero easily covered) in Seat 1
Hero (~$450) in Seat 4 with K♠ Kx
Villain raises to $25
Folds to Hero
Hero raises to $75
Folds to villain who calls
Flop: T♠ 6♠ 3x
Hero bets $150
Villain goes all-in.
So at this point I have about $225 or so left, so I'm getting about 3-1 if I call. Of course I have an overpair and a just picked up a flush draw, but villain could already have the nut flush. I feel like the pot is too big to fold, considering I have the flush redraw and there's a decent chance I'm still ahead. However, villain could have A♠ x♠ so I'd be drawing dead. So I have trouble seeing how to fold, but at the same time calling seems like I'm getting way too much committed with just an overpair. This leads me to believe I did something wrong in getting there.
I'd rather not focus too much on this specific villain, and I didn't know much about him, but for completeness here's what I do know. I had only been at the table for about a half hour, but I had already seen villain open raise preflop to $20-25 or so. He had about $900 when I sat down (max buy-in $300), yet he was complaining when I got there about how long it'd been since he flopped a set.
Also, on the very first hand I was there I was dealt AKo. This same villain limped, seat 2 raised to $10, and then I reraised to $30. Both called, villain check-called a 3/4 pot size bet when I flopped the king, and then after check-check turn he tried to bluff the river. I called him and he showed the A which was likely half of the missed nut-flush draw. I don't know if that info helps, but that's about all I had on this particular villain.