[QUOTE=SteveB;826913]
I am dating myself with this one:
U.K. Whitworth, Imperial and standard fasteners.
U.S. Coarse thread and fine thread.
To confuse the US mechanics on the forum.
Whitworth and standard spanners (wrenches) are marked by the size of the fastener, not by the width of the opening on the spanner (wrench). Most of the machinery I worked on used these. I had no problem working with these until the metric system started being added.
QUOTE]

And then it gets really fun when you have a vehicle with Whitworth, SAE and Metric compunded by 30 years of people tinkering/ fixing it and rust/ wear-n-tear [it is a '73 Land Rover]

The automotive translation that I have not seen in this thread is
Breakfast = Grill [the section on the front of a a car between the fenders/ headlights]