I'll take a few Sub's, please!

Here's a good one from another Williams alumna. It's a little tough to see, but the apostrophe is in the word subs. Or, I guess it's Sub's. Anyway, Mr. Sub owns the steak, the pastrami, the veal parm, etc., but Ms. Salad does not own anything because she is just appropriately plural. I still don't get how you can get it right in one part of a sign, but wrong in another.

My theory is that if someone shortens a word - like writing sub for submarine - then an apostrophe gets put in there for no reason. Perhaps it is to take the place of 'marine'.

Sandwich boards are always good for misfit apostrophes.