Because of the bark
or
One is really heavy, the other is a little lighter.
or
but I've been trippin' all day.
or
Because he wears a size "S".
or
After you die, a leech stops sucking your blood.
or
CoFe2
or
Hell, you need 250 just to lobby for the research grant.
or
Twenty. One to hold the bulb, two to turn the ladder, and 17 to be on the guest list.
or
They keep dropping their trunks.
or