I've encountered a few celebs in the restaurant biz, but my favorites were Whitney and Bobby. They used to come in to Copeland's at night and sit at the bar. They were always laughing and seemed happy. Of course, it may have been the drugs.
Usher came into another place wearing pajamas and fuzzy slippers, and acted like a little child. He would hide under the table, giggling and kept getting up and dashing to the door and back. Odd dude. Maybe it was drugs...

met buster crabbe (played tarazan) many years ago at home town diner, as well as gomer pyle and rock hudson.