Because it wanted to be a flat screen.
or
One's a spineless, poisonous blob. The other is a form of sea life.
or
They charged one - and let the other one off.
or
Because pepper makes them sneeze
or
The question is irrelevant, since you couldn't find the dolls even if you knew how many. (Note: Well, this was a good joke in 1983-84. . . .)
or