Okay, so the name of this actor is in the title. He plays Hotch on Criminal Minds. So, one day I was watching the bloopers for the show and I "think" I found a clip of him sneezing. It's off camera, (Why?) but it sounds like it was near the camera plus he sounds like he's near the camera. Also, after the sneeze, Paget Brewster (Prentiss) gives a little smirk, maybe indicating it was him. Here's the clip:
The sneeze is at around 1:35ish.