Rabbi Robin Williams?

It might sound far-fetched, but after the famous comic and actor posted a picture on Twitter showing him with a white yarmulke on his head, it might be time to start speculating.

“Too late for a career change?” he wrote. “Rabbi Robin.”

In fact, Williams was wearing the Jewish head covering for his new TV show, “The Crazy Ones,” on CBS. The name of the episode, which aired February 17, was “Zach Mitzvah.”

The episode revolves around a hotel executive whose son is having a bar mitzvah, and Zach, one of the show’s main characters who also performed at the bar mitzvah, turns out to have a past as a top-flight bar mitzvah singer until he lost out to another performer in the area.