How they process things.
It's a habit.
Recoil
A: Because they added 486 and 100 on the first Pentium and got 585.999983605.
One empties your pocket. The other makes Hot Pockets.
Republicans sign their checks on the front, and democrats sign on the back.
The phrase I went through a whole box of tissues watching that film. is a good place to start.
OC By process of elimination.