In an advert for toothpaste I think, a woman in a white lab coat, holding a clipboard saunters across centre stage saying
"I know a lot about formulas..."
Not enough,it seems, to call them "formulae".

Courtesy of Billy Connelly's World Tour of Ireland last night:

"There's a bug going around."
How does he know? The Coast Guard told him:
"What's that off the starboad bow? Looks like a bug. Yep, it's a bug alright. Quick! Ring all the doctors. There's a bug going around."

Glenn