When people start a sentence with, "With all due respect...", because what it really means is, "Fuck you, and here's why...".
I got one of these in an email at work today when I assigned an issue/defect to someone for review. I can shrug that off, but then to add further insult, the same person stops by my desk 10 minutes before the end of the day to say, "I didn't mean that disrespectfully, but [insert a more detailed explanation of why you can go fuck yourself]." I have to laugh, because I was actually asked to assign the issue to this person by my lead, and it's very rare for me to report something that isn't a legitimate issue that needs review. And if the person I assign something to doesn't think it's appropriate for them to spend the time on it, they can save the bullshit complaints and simply say, "This should go to person B instead since they own this particular thing."
Also, on today's drive home, I was making a left turn at a light when it was yellow, about to turn red, when some asshole in another car zips up on my right, with his left turn signal on, cuts me off and does a U-turn in all of about 2 or 3 seconds, leaving me at a red light with another asshole behind me in a big pick-up truck inches from rear-ending my car. I barely had time to register what was happening and stomp on the brakes. Just the sheer fucking audacity of some people on the road is unbelievable. I completely understand road rage.