A sponge!
or
1,000,001: One to change the bulb and 1,000,000 to rebuild civilization to the point where they need light bulbs again.
or
Because there are too many ears.
or
What's the use, they'd still have bear feet
or
When a rooster wakes up in the morning, its primal urge is to cluck defiance.
or
I've been framed.
or