It was pretty funny. Best part was that they sang some proprietary, hand-clapping birthday song that was most definitely loud and obnoxious.
Oh you didn't know that? That's the default restaurant "Happy birthday is copyrighted" song. I always assumed it was nationwide but it might be West Coast. I know it's as far east as Texas but now that you mention it, I've never heard it in Florida, New York or Boston. I hadn't given it much thought. Patient Zero might have been Red Robin but that is anecdotal with an n of 1.
Doesn't work without the id: http://www.theatlantic.com/entertainment/archive/2015/09/the-chilis-version-of-happy-birthday-an-elegy/406999/ I'm surprised to see they aren't all the same song. Guess I never payed much attention.