Since "Seinfeld": Favreau has acted in many films, and he's become one of the preeminent directors in Hollywood over the years with his work on "Elf," the three "Iron Man" films, and the recent ...
To the surprise of many, the 70-year-old comedian started singing the lyrics along with Littrell — and yes, Seinfeld even appeared ... Aidy Bryant, Molly Shannon, and Adam Sandler.