Okay, you'll definitely have to explain the NORMAL mug of HALF A LITER!

I'd say it reaches abnormal above 500ml, but there's nothing abnormal about mugs like this: https://www.ikea.com/no/en/p/faergklar-mug-light-pink-506048...

It seems people think 500ml is more liquid than it is due to how thin cans/bottles are comparatively.