The father has lost his sunglasses, so he asks his son if he has seen them.

The son hasn't, but decides to make a funny to lighten the mood, saying, "no, but have you seen my dad glasses?"

Son sounds like Sun.

"Son" glasses, get it?

It centers around one of the oldest dad jokes out there, the one that almost all dads revere and aspire to tell.

"Daaaaad, can you make me a sandwich? I'm hungry!"

"Hi, Hungry.... I'M DAD!

collapses and dies happy

The age old practice of Dad pretending your self-dectriptive verbs are your name (and that he is, in fact, Dad) has helped pave the way for modern Dad Humour.

Here, Son is phonetically the same as sun. The joke is that Dad refers to his glasses with "son-/sun-" while Son refers to his own glasses with "dad."

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