"Knock, knock"
"Who's there?"
"Panther"
"Panther who?"
"Panther no panth, I'm going thwimming"

"Knock, knock"
"Who's there?"
"Oswald"
"Oswald who?"
"Oswald my gum"

"Knock, knock"
"Who's there?"
"Mayonnaise"
"Mayonnaise who?"
"Mayonnaise have seen the glory of the coming of the Lord..."

(I remember all of these from high school or earlier, some 40+ years ago)

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"Go yell at an M&M"

Knock-knock.
Who's there?
To.
To who?
It's "To whom."

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"What's your claim?" - Ben Gravy
"Your best work is the work you're excited about" - Rick Rubin

How many tickles does it take to tickle an octopus?

Tentacles!

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"What's your claim?" - Ben Gravy
"Your best work is the work you're excited about" - Rick Rubin

Why did the chicken cross the road? To see the ugliest human on earth.
Knock-knock. Who's there? The chicken.

What did the Zero say to the Eight? ... Nice Belt!

Additional humour points for delivering the answer with concurrent hand gestures to demonstrate the belt!

Michael

Why did the Easter Egg hide?

He was just a little chicken.

How many Lowes could Rob Lowe rob, if Rob Lowe could rob Lowes?

OK, that's not a joke, but it sure sounds funny

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"What's your claim?" - Ben Gravy
"Your best work is the work you're excited about" - Rick Rubin

Little boys always love this one :

Why do girls wear makeup and perfume?

Because they're smelly and ugly