Pet Peeve: Local, County, and State guys who are always 10-15 mph or so above the speed limit. Don't give me this, "They're going 'quiet' to a 'situation'" if there was really a "situation" than I'd hope they'd be going much faster (When they're responding with lights/sirens in some cases they're 30 or 40 plus over the limit).
This.
Also, when they whip an illegal u-turn and then just nonchalantly drive off in the other direction.
Don't give me this, "It is safe to do since they have been trained." If that is your argument, then I'd say, "It is safe for me to do because I have two eyes and a functioning brain so I also know when I can make an illegal u-turn and not cause an accident."