When does a joke become a ‘dad’ joke?

When it becomes apparent.

What do dentists call their x-rays?

Tooth pics!

"Why does the parrot cost so much?" asks the man. The owner says "Well the parrot knows how to use a computer."

I bought the world’s worst thesaurus yesterday. Not only is it terrible, it’s terrible.

What do you call a dinosaur with only one eye? A Do-you-think-he-saw-us!
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