"What the fuck did you do to my phone?" has got to be the most irritating line from a user ever. I didn't touch your phone, so just because I know IT that means I messed up your phone? That's stupid.

I got sent to the dean's office because of this. I got pissed off enough at another kid accusing me of doing stuff to his computer in our "computer class" that I yelled "I didn't touch your fucking computer!"

Was almost suspended for that.