things and people that I find really annoying:

• twelvies
• my aunt
• my aunt's cat
• my cousin
• people who steal my formats 
• people who whistle
• people being unnecessarily loud
• people who touch my stuff
• people who invade my personal space
• people who take my food without asking
• people trying to talk to me when I'm studying
• people who don't use decent grammar
• people who don't know when to stop
• people who alway think they're right
• people who are close-minded
• people who look down on others for their ethnicity,
  sêxuality, gender, political beliefs, sêx life (or lack thereof),
  occupation (or lack thereof), differing opinions etc.
• people who don't give up their seat for the elderly, disabled or pregnant on public transport
• people who lack basic manners
• people in general.