Farha Flops Top Two Pair

After a flop of [QhJs5c] and with T40,000 in the pot Sammy Farha leads out with a pot sized bet from the small blind. The button thinks for a moment before making the call.

The turn is the [As] and both players check. The [5h] falls on the river and they check it down again. The button is about to turn over his hand like he has a winner, but after seeing Farha flip over [QdJc] he quickly mucks his cards.