VIDEO: Marshawn Lynch, Rob Gronkowski play 'Mortal Kombat' with Conan O'Brien

The week leading up to the Super Bowl can be a stressful time, but Marshawn Lynch and Rob Gronkowski let off some steam Thursday on "Conan."

Lynch and Gronkowski played "Mortal Kombat" with Conan O'Brien, each showing off their distinct sense of humor on the show.

Gronkowski presented O'Brien with a portmanteau of the Lombardi Trophy combined with a severed head, alluding to their "Mortal Kombat" match. 

Lynch also showed O'Brien the proper crotch-grab technique and was notably excited when a game ended after a character punched another in the groin. 

It's good to see star players let loose and relax before the biggest game of their careers. On Sunday, it will be all business for the Seahawks and Patriots. 

- With h/t to SB Nation's Rodger Sherman.