Toddler Humor

Brad is really into jokes and riddles right now but most of what he says is pure gibberish. Here's a typical joke:
Knock, knock
who's there?
Apple
Apple who?
Knock, knock
who's there?
Apple
Apple who?
Orange you glad I didn't say "apple"? (although he did say "apple")
Then Sky tries to set things straight and things really go south because Brad thinks his nonsensical joke is hilarious as she tries to point out all of the problems.
Just another day in our lives...