A pet peeve that really drives me crazy is when people don't use earphones when they are traveling by public transportation and have the music of their cellphones at full volume and don't care of other's people peace. I remeber when I was traveling from Quito to Riobamba and the person who was next to me put music on his cellphone but it was so loud and i couldn't sleep, i don't use to be a bad tempered person but that day I was really mad about that.