Knock knock- whos there

Answers

1. Gus. Gus who? Gus what we're having today!
2. Boo. Boo who? Don't be such a crybaby!
3. Twit twit. Twit twit who? Am I talking to an owl?
4. Woo. Woo hoo? You don't sound like Homer Simpson.
5. This is Social Services. We're here kidnap you. If you do not co-operate, we will treat you to your favorite ice cream.