Perhaps the other 20% contains your powers of addition; those don't seem to have crystallized yet, either.

A blonde walks into a room with some sort of ice tray filled with a thick red substance. She offers it around.

Tipsy Blonde: They're not quite frozen yet, so they don't come out very easily.
Girl: (taking the tray and leaning in to inspect) What is it?
Tipsy Blonde: It's, like, 2% cranberry juice, and 78%, you know, alcohol..."

-- Perth, overheard by canadiancornpop