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.

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"

An Italian businessman goes to Indonesia for a business trip. He hates Indonesian food, so he asked the concierge in his hotel, "Is there any restaurant where I can find Italian food here?" The concierge says, "You're lucky sir, a new pizza restaurant just opened and they deliver." The businessman asks for the restaurant's number, goes back to his room, and orders the pizza.