You Know This - Bamana Who?

Today is my nephew Cameron's 6th birthday!

At dinner he told me this knock knock joke...

Cameron: knock knock

Bethany: who's there

C: bamana

B: bamana who

Cameron: knock knock
Bethany: who's there
C: bamana
B: bamana who

Cameron: knock knock
Bethany: who's there
C: bamana
B: bamana who

Cameron: knock knock
Bethany: who's there
C: bamana
B: bamana who

Cameron: knock knock
Bethany: who's there
C: orange
B: orange who

C: you're glad I didn't say bamana, huh?!