Well, this isn't the ace on the flop, but I just played a hand with Kings that the Ace came on the turn. I was sure this person was going to make this move as they were running about 60% VP, and I think the way I played it got me the most I was going to get out of the hand. I was sure after the turn bet he was taking a rather week stab at a bluff on the ace, and the river bet was an instant call. - criticism welcome.

PS - sorry about using the letters - I'm not allowed to post URLs yet.

PokerStars No-Limit Hold'em, $0.05 BB (9 handed)

UTG+1 ($2.90)
MP1 ($2.78)
MP2 ($3.43)
MP3 ($5.58)
Hero ($5.88)
Button ($11.33)
Villain ($9.95)
BB ($9.62)
UTG ($7.20)

Preflop: Hero is CO with Ks, Kd.
2 folds, MP1 calls $0.05, 2 folds, Hero raises to $0.35, 1 fold, Villain calls $0.33, 1 fold, MP1 folds.

Flop: ($0.80) 3s, 3d, 9d (2 players)
Villain checks, Hero bets $0.65, Villain calls $0.65.

Turn: ($2.10) Ah (2 players)
Villain bets $0.4, Hero calls $0.40.

River: ($2.90) 7d (2 players)
Villain bets $0.3, Hero calls $0.30.

Final Pot: $3.50

Results in white below:
Villain has 4h 9s (two pair, nines and threes).
Hero has Ks Kd (two pair, kings and threes).
Outcome: Hero wins $3.50.