"Knock Knock" joke

Person 1: Knock, Knock
Person 2: Who's there?
Person 1: Cows go.
Person 2: Cows go who?
Person 1: No, silly! Cows go moo!

Don't knock on Death's door.
Instead, ring the bell and run. Death hates that...

Knock Knock
Who's there!
Toucan!
Toucan who?
Toucan live as cheaply as one! Knock Knock
Who's there!
Toucan!
Toucan who?
Toucan play at this game!

Knock Knock!
Who's there?
Who who.
Who who who?
Is there an owl in here?

Natalie Cole, in response to Amy Winehouse's multiple Grammy win, said that Ms. Winehouse shouldn't have won due to her recent struggle with drugs. "...you don't get to just do your drugs and go onstage and get rewarded." If the Grammy voters based their vote on what more...