People here are mad on Imperial, but they often have no idea how it all works. Whenever anybody goes on about 'foreign' measurements, I always ask them "how many feet in a mile?" - very few have any idea.
An old boy was moaning to me about kilograms once - "Why don't they wait until all the old people are dead? I don't know what a kilogram is." I asked him when he last bought a two-pound bag of sugar (having just made a cup of tea and seen a new bag in the cupboard). "Last week" was the answer. "No it wasn't" I told him, "you last bought a two-pound bag of sugar in 1968, you have been buying kilogram bags ever since then, and you still don't know what a kilogram is...?"
It sort of made sense 300 years ago - he thought 100 was blood temperature, but he might have had a touch of 'flu at the time, and he thought that zero was as cold as it would ever get.
There's always Réaumur, if you really want to confuse people