I've just seen this.
I once witnessed this very thing in the office canteen. A very quiet, rather timid lady, who always sat on her own, was carrying her tray from the hatch to the cutlery station, but when she stopped, her lunch didn't. It overshot the tray and landed upside down on the floor. She hurried back to the hatch and whispered nervously to the assistant. Unfortunately the assistant was the one known as Pam the Voice. The words
'OW DID YA MANAGE THAT???
rang out across the room, and everything stopped.
How to make a spectacle of yourself without really trying!