Comic strip of a ghost and a person with the American flag pasted on the head. The ghost repeats "Boo!" in the first three panels without getting any reaction, but when it in the fourth panel says "kg, cm, km, °C" the American gets scared and screams "AHHHH!!!".
You know what pissed me off earlier this year? We took a trip from the U.S. to Canada and my Prius didn't even have the option to show kmph instead of mph on the dashboard. We looked through the manual, we looked online. My specific model doesn't allow it. Why?!
What really grinds my gears - literally - is having to have two sets of sockets because America. It's really gets annoying when you lose your 10mm socket and the other one isn't quite right, but you can't work out is 18/32s is close enough and then you bust a nut.
Europeans acting smug like knowing how close to boiling the temperature is is more important than knowing how close to 100% hot out the temperature is.