Oh boy, I caught myself being a real geek the other night.

My wife was watching Target. A clip about firewood was on (perhaps it was an old recording).

A pile of firewood had been separated for measurement - hard wood from soft wood. Soft wood was about two-thirds of the total pile. Dampness % were measured for the soft wood pile, then the hard wood pile, then a calculated average dampness for the total load.
A very damp pile, according to their expert.

I immediately insisted my wife press pause, I launched from my chair, loaded Excel and double checked their average calculation.

"AH HA!! they didn't do a weighted average! - how unfair is that?!"

I got rolled eyes and an unpause for my efforts...