The extreme crapulance of those annoying plinky plonky 50 year old ice cream vans belching out thick black smoke from claped out old engines. You're there chilling at home to some tunes when the best bit comes on. Just as you get it into it you hear DING DING DINGLY DING DANG etc. etc. Winds me up good and proper.
Also the fact that some people insist on driving a hundred yards when its nice when you could walk instead or bike it instead. So there they all are driving a 100 yds in 4x4s just to get an ice cream from the local shop, stinking up the air with their filth and heating things up even more.
The fact that I tan crap as well annoys me...
