There might not be. Steve Smith is one of the toughest players in the league, so there probably isn't. Big hitters have gotten into the heads of receivers pretty much throughout football's history, though.
What is the clap snap thing Cam does now all the time? I thought it was like a hurry up the clock about to run out thing but he was doing it regularly with plenty of time remaining on Sunday.
Amount of times he claps Kalil will snap at that set number, we use many snap signals. Hard count under-center. Arm pull, Guard tap(Hangman watches Cam and taps Kalil when he's ready), and now the clapping.