Couples who sit on the same side of the booth when there is no one on the other side.
Parents who bring their young kids to R rated films. People who blame anything but themselves for THEIR failure.
People who sit next to you on public transportation even when there are other seats available.
Students who prolong class by asking the most inane questions.
Women who wear jewelry that clinks and clacks and makes noise when they're at their desk or keyboard.
When people take 20 napkins, use one, then throw them all away.
Going through the drive thru, then having to go back when they screw your order up.
People walking around in ridiculous 'fashionable' shoes that are clearly hurting their feet.
Whenever anyone says "Ya, know what I'm sayin"...
Using speaker phones in public areas at work.
Roadmaps that aren't folded correctly.
The way people walk in flip flops.
Someone standing over my shoulder reading the computer screen.
People who write "Noone" instead of "No one".
Explanations that begin with the word "Again".
People who don't cover their mouth while sneezing or coughing.
Dirty dishes in the sink.
People who habitually need favors.
People talking loudly on their cellphones in public
People talking or texting on cellphones while their friends are right beside them
People talking or texting on cellphones when at a register and someone is trying to help them with their purchases
People driving who wait until the last second to try to get in
the lane that they knew they would need to be in ten minutes
A pet peeve is something that really annoys that particular person and he or she can have more than one pet peeve.
My biggest pet peeve (especially on Q&A sites like this) is when people misuse the words "then" and "than" when they ask or reply to a question.
Like in the first phrase of my response the correct form is "... have more than one..." and not "...have more then one...". Than indicates a choice - then indicates a sequence. Two completely different words.
Anothere peeve of mine is when a person says that they are going to the liberry to get a book. The word is library. I could go on, but I think you get the idea.