Clock and Orphan's Dad Comparison

Alright, listen up, you uncultured swine. You, with your constant craving for validation. So, this joke you posted uses a play on words. It sets up a comparison between a clock and an orphan's dad. The punchline is that, unlike an orphan's dad, a clock "comes back around", which is a double entendre. Get it? It implies the dad isn't coming back, which is dark, and is also the very definition of a clock.