Because it would fall over if it lifted the other one.
or
A porcupine with split ends
or
Five. Four to decide which way the bulb ought to turn, and . . .
or
The same thing Arkansas.
or
Three. One to climb the ladder while the second kicks the ladder out from under her. And the third to say, "I knew that was too high for you dear."
or
or
Because it goes good with chips.
or