Is there a restaurant grade, below “F”?  What soda dispenser is gummed up, on 5 of its 6 nozzles? Some other choice samples include nicely labeled ‘out of order’ signs… and nicely labeled signs with questionable typeface.

On this one, I like the ‘nom nom nom.’

 (Photo source: oddee.com , one of the greatest time-wasters research sites, ever invented for the web.)