Not very many of them know how to dance
Like a joke that involves a pun on a word that has different meanings in different languages. Please tell us what languages they are in.
When life's getting a little ruff ...I'll see myself out
Depends on what tune the Devil happens to be playing. Ha. Ha ha. Ha ha ha.
Because they forgot the g in graveyard.
Because he's not a rat.
Rats!
Because so few of them can dance!