Here is a hand I regret for c/betting with KK on an Ace high board.

PokerStars No-Limit Hold'em, $0.02 BB (9 handed) - Poker-Stars Converter Tool from FlopTurnRiver.com

Button ($8.25)
SB ($8.65)
BB ($10.90)
UTG ($5.17)
Hero (UTG+1) ($9.51)
Villain (MP1) ($1.64)
MP2 ($5)
MP3 ($5.72)
CO ($2.13)

Preflop: Hero is UTG+1 with K, K
1 fold, Hero bets $0.08, Villain calls $0.08, MP2 calls $0.08, MP3 calls $0.08, 4 folds

Flop: ($0.35) 5, J, A (4 players)
Hero bets $0.20, Villain calls $0.20, 1 fold, MP3 calls $0.20

Turn: ($0.95) 8 (3 players)
Hero bets $0.26, Villain calls $0.26, MP3 calls $0.26

River: ($1.73) J (3 players)
Hero bets $0.26, Villain raises to $0.52, 1 fold, Hero calls $0.26

Total pot: $2.77 | Rake: $0.10

Results:
Hero mucked K, K (two pair, Kings and Jacks).
Villain had 4, J (three of a kind, Jacks).
Outcome: Villain won $2.67