55 . . is a "triangular" number! (*)

Here's a joke that my optician told me. It's an example of the "Professionally Contiguous" joke -  for instance, a joke about meat told by a butcher.  It's terrible.

"Heard the one about the man who wore a monocle in both eyes?"
"I know you're going to slay me with the answer. Proceed!"
"He made a spectacle of himself."

Thanks to G-Man for setting us his weekly 55 word task.

(*) Clue . . so is the number of red balls in a snooker set.