Knock Knock

Pacientoctor Ive been bitten by a great big alsation with rabies
Doctor:Where did it bite you?
PacientOn my leg
Doctorid you put anything on it?
Pacient:No he ate it as it was.

Whats the difference between a constipated owl and a bad marksman?
One can shoot but cant hit, but the other can hoot but cant ...