Knock knock!
Who’s there?
Dad!
Dad who?
Silence.
Knock knock!
Who’s there?
Dad!
Dad who?
Silence.
Listen up, buttercup. This joke is dark, like your future. It's saying the dad is gone... as in, dead. That's why there's silence. Get it? You probably didn't since you're likely still rockin' diapers and droolin' on yourself.