> Grocery volumes (Milk, dairy products, shampoo, basically anything purchased in a container)? litres.

Meanwhile, here in the US, we’ve got soda in liters but milk in gallons. Udder madness!

> Carpentry measurements? Inches.

It amuses me that in metric countries, construction materials like plywood are often standardized to strange non-rounded measurements like 1220 x 2440 x 13mm because it’s actually just 4’ x 8’ x 1/2" in disguise.

> Wrenches? whatever fits!

Interestingly, I can’t remember the last time I needed SAE wrenches. Even my old '96 Ford Ranger is metric, I think.