Did A Contestant Uh...Pass Gas...on Wheel of Fortune?

Something interesting happened on a recent episode of Wheel of Fortune - a contestant may have farted. 

It's hard to tell what happened because the camera was on the board at the time, but as a woman was yelling out the letter she wanted, there was a fart sound and right after it, she said, "Excuse me." 

Host Pat Sajak wrote it off saying, "That's okay, all I heard was a noise. I just heard a sound. Unidentifiable," but he spent the rest of the round giggling.