Comedian Cole

We have been saying "knock-knock" jokes around here for a while.  Not sure how it got started but here are two of Cole's. 

Someone:  Knock, Knock
Another someone:  Who's there?
Cole:  Papa
Someone:  Papa who?
Cole:  Oo..oo..ah..ah (like a monkey)

Someone: Knock, Knock

Another someone: Who's there?
Cole: Papa
Someone: Papa who?
Cole: Grams