Well Played Sir
In a very sincere tone, he pointed out a possible marked card in the deck. The dealer retrieved a few cards from the muck, but eventually Pham grabbed the card in question and checked it out. It was the and Pham tossed it back into the pile.
After some mild confustion, it quickly become obvious that there was no marked card, and this was merely a ploy by Pham to see the would-be river card. It worked quite well.