Knock Knock...
Who's there?
Doctor...
Doctor Who?

Knock KNock..
Who's there?
Cook...
Cook Who?
mmmm First one I heard this year!!!

Knock KNock...
Who's there?
Boo...
Boo Who?
Please stop crying and let me in.

Knock Knock...
Who's there?
Ipe...
Ipe Who??
I thought I could smell something!!!!