Dick Van Dyke breaks out in song to surprised Denny's diners

Last week while dining at Denny's in Santa Monica, Dick Van Dyke and his a cappella Vantastix buddies broke out into song. Although not quite a flash mob, it was a surprise performance of the song "Chitty Chitty Bang Bang" for the lucky diners at the coffee shop.

"Breakfast at Denny's, with a side of grits makes me want to sing!!" Van Dyke wrote on his Facebook page Saturday.

Van Dyke played the eccentric inventor Caractacus Potts in the 1968 film "Chitty Chitty Bang Bang," which was co-written by Roald Dahl and was based on a story by Ian Fleming, of James Bond fame.

Thanks U.S. News!