My big pet peeve is the improper use of: "waiting on" vs "waiting for" - but it seems that more and more people all the time, use it the wrong way.

Waiting for - anticipation of a coming event or action.
i.e. - I'm waiting for a UPS delivery. I'm waiting for Billy to get home from school. And so on... I'm not waiting on these events.

Waiting on - a service given to one person by another.
i.e - The waitress is waiting on tables. The sales clerk is waiting on a customer. And so on... They are not waiting for these people. Of course in this neck of the woods, a lot of people seem to think it's one word too: waitin'on.

I was raised in New England, and never heard anyone use "waiting on" in the wrong way - until I met my ex - who was raised in Pa and Md. I'm assuming it's a geographical thing, but I do hear it more and more all the time. I was able to break him of it , and my kids and grandkids have always used it the correct way.

Another one that gripes me is "seen" when it should be "saw".

A very educated friend of mine cannot be convinced that she is saying something wrong. She's meaning to say "It's a dog eat dog world", but instead insists on saying "It's a doggy-dog world". For the longest time I couldn't figure out what the heck she was talking about, and then the light went on. I politely told her in a joking manner what it should be, but to no avail...