I think I've posted this one here before, but still:
How can you tell there's a halfling in your fridge? There are footprints in the butter.
How can you tell there's a dwarf in your fridge? There are footprints in the butter, and all your beer is gone.
How can you tell there's a sorceror in your fridge? FIREBALL!
OK, and another one:
Knock knock!
Who's there?
Interrupting sorceror.
Interrupting sor-?
FIREBALL!
How can you tell there's a halfling in your fridge? There are footprints in the butter.
How can you tell there's a dwarf in your fridge? There are footprints in the butter, and all your beer is gone.
How can you tell there's a sorceror in your fridge? FIREBALL!
OK, and another one:
Knock knock!
Who's there?
Interrupting sorceror.
Interrupting sor-?
FIREBALL!