When does a joke become a ‘dad’ joke?

When it becomes apparent.

Did you hear about the first restaurant to open on the moon?

It had great food, but no atmosphere.

I told my boss three companies were after me and I needed a raise to stay at my job. We haggled for a few minutes, and he gave me a 5% raise.

The man then asks about the next parrot and learns that it costs $1,000 dollars because it can do everything the first parrot can do plus it knows how to use the UNIX operating system.

30 minutes later, the delivery person shows up with the pizza. He takes the pizza and eats it. Suddenly he's sneezing uncontrollably and shouting to the delivery person, "What did you put on this pizza?!"

The delivery man bows deeply and says, "We put exactly what you ordered on the phone, sir. It's pepper only"