One is a blood-sucking parasite, the other is an insect.
or
A conversation.
or
No one knows. Republicans automatically disbelieve him, and no one can ever trust a stinking liberal anyway.
or
the barman says "Oi - get out! We don't want your type in here"
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