When my ski company tries to run certain lifts on days that are forecasted for high winds and I'm saying "I told you so" to my boss after the lift is shut down due to wind.
Also, people who drive slow. See that white sign that says "speed limit 55 mph?" Yeah? Then how about you step on the gas pedal until your car is doing FIFTY FIVE FREAKING MILES AN HOUR.* Not asking you to speed. Just do the speed the sign says. Please.
*disclaimer, yeah yeah, if conditions are bad you can drive slow