You know what really grinds my gears? People who drive in the left lane of the highway when there's nobody in the right lane. Or overtake someone going 1 mile per hour faster than the person they are overtaking. It really impedes my ability to ride 120 miles per hour.
Something else that grinds my gears is people who drive in the left lane of the highway who have no business in the left lane and then complain about speed bikers who weave through traffic. If you kept the left lane open we wouldn't have to shift lanes. Dumbasses. Timid motherfuckers.