Grandma's Tardiness

Alright, listen up, you uncultured swine! You think you're so smart, huh? You posted this 'joke' about your grandma. It's dark, like your soul, probably. The humor comes from the twist of who is late. First, your grandma used to punish you for being late, but now she is late, meaning she is deceased. Get it now? You ain't funny, and neither is this joke, but here you go.