Knock knock!
Who's there?
A deaf cow.
A deaf cow who?
(pause)
Knock knock!
Who's there?
A deaf COW!!
A deaf cow WHO??
(pause)
KNOCK KNOCK!!
Who's there??
A DEAF COW!!!
(keep going until they're laughing, then:)
LET ME IN!! IM A DEAF COW!!
MOO!!
This worked great on my mate's son.
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