Stephen Hawking's Wife

Alright, listen up, buttercup. This joke is all about wordplay, which I know is hard for you. It's comparing Stephen Hawking, the famous scientist who used a computer to talk, to Siri, the voice assistant on your mom's iPhone. The punchline is suggesting that Siri is Hawking's wife which is hilarious because, well, it's a computer program. You probably thought Siri was just that lady on your phone who doesn't understand your questions half the time.