You walk up to your costar, Matthew when he and his friend, Andy make a mock documentary called 'Matthew Gray Gubler: The Unauthorized Documentary', knowing he was doing improv as a little joke to the cast, only informing them a few seconds before they even start filming that little piece.

He and Shemar, another costar who plays Derek Morgan, were goofing around currently, pulling out their stunt guns in western-standoff style. Matthew pulled his stunt gun out first, so he starting celebrating minorly, spinning his gun on his finger and tossing it in the air, trying to catch it. It drops to the ground with a thump.

He hears you laugh and turns with a smile. "What are you laughing at?" He chuckles.