Stupid Spelling Error's on Sign's

Grammar and punctuation are very important to me. Here, if I make mistakes (obvious ones), it's usually because I'm tired, and then too lazy to go back and correct it. I usually try to, though (was that the correct "to?").

Anyway, I'm really bugged when I see signs at buildings advertising something and there is a glaring error. A very common error is the use of the apostrophe s. It's a simple rule: If you are showing ownership, use the apostrophe. If it's just one thing that is doing the owning, add apostrophe s. If it is two or more things doing the owning, make the word plural, and then add the apostrophe. If you are simply showing a plural noun that ends in an s, do not use an apostrophe. The s will suffice.

There is a tavern that I pass by on my way to work each day. They apparently have a tank with some huge pirranahs. For the longest time, the sign outside the tavern read, "18-pound pirranah's inside..." Pirranah's what? Pirranah's tank? Pirranah's fin? I believe they meant that they had more than one 18 pound pirranah. Therefore, just add the s. You only meant to make it plural.

This year, I noticed a gas station nearby. They had a sandwich board out in front advertising a special for "collage students." Now, would that be college students? Or are there in fact students who study the fine art of the collage? I did finally stop in at the gas station to inquire which type of student they meant. They did mean "college" students. They corrected their sign.

If some business is putting out a message for the public to see, then they had better make sure it's correct. They are creating an image for themselves.