Smart phones, well... not in themselves as such but some persons usage of them.
People who sit engrossed on them (facebook no doubt) in company, find that quite rude even if it's not intentional.
Also people who walk along the street oblivious to their surroundings, had a few people walk out in front of my car because obviously whatever was happening on faceplook was more important than paying attention to their surroundings.
There's a time and place is all I'm saying.
While I'm having a good old rant... drivers who don't use indicators... grrr...
Annoys me just thinking about it.
<-- takes deep breath and counts to 10.