In no particular order:
1. My mother.
2. My neighbor's pit bulls.
3. Neighborhood cats pooping in my garden.
4. Buttheads leaving butthead comments on my blog.
5. Political extremists on both sides of the spectrum.
6. Stupidity in all it's many flavors.
7. Austin drivers.
8. My grocery store's diminishing number of carried brands in everything.
9. People who are incapable of putting down their cell phone (or removing their Borg implant).
10. Weeds.

I could go on (and on and on), but you only asked for 10. ;)