Oh yeah. S'time for this topic.
What makes you mad? What agitates you? I've got a good one to start off with: Radio Stations.
They're always playing the same cruddy songs every day. I'm sick of listening to the radio now because they never play anything good. Did you know that once I heard two radio stations playing the same freakin' song with one station being about 10 seconds ahead of the other? Why? Because literally every station plays the same crap.
You know what else grinds my gears? You not making an intelligent and well thought out post on my topics, start typing. You.