Maybe I'm a bitter person, but there never seems to be a shortage of pilots on the other end that annoy the hell out of me.
For example:
Pilots who are flying an ILS,
on an IFR flight plan, announce out of no where that they are now "IMC" Congrats, no one cares. (I can understand if ATC gives traffic call, but out of nowhere? common)
Pilots who abuse the hell out the air to air freq and announce their position every 30 seconds when no one else is around for miles. Don't worry I think you sound really cool on the radio too

. Nickel up or go-guns if you want to talk to someone at length, especially when there are ten thousand 172's in a square mile of airspace who actually should be talking to each other to avoid making the local headlines.
And these a-holes make me want to pull over to the side, get out of my airplane and beat them senseless. Pilots who fly 500' and 500' offshore in what ever weekend warrior plane they can rent. That giant 40x100 sign with a beer bottle on it moving at the same rate as me gives me a reason to be that low, what is yours?
And finally, If I can see you before you see me when I'm towing a banner, I should be able to take your license.
Please feel free to add.