All the good doctor ones are done, as it's for kids will a knock knock joke do ?
Knock knock,
Who's there,
Banana,
Banana who?
Knock knock,
Who's there,
Banana,
Banana who?
Knock knock,
Who's there,
Banana,
Banana who?
Knock knock,
Who's there,
Banana,
Banana who?
Knock knock,
Who's there,
Orange,
Orange who?
Orange you glad the bananas gone.
My neice told me that when she was 8, I still laugh at the memory.