An 80-year-old blind man asks his grandson, "Can you grab my glasses?"
Then the grandson says, "Did you get in the flour again?"
Grandpa said, "No, it was the weed."
Okay, listen up, buttercup. This joke is funny because the grandson thinks his grandpa is covered in flour, which would make sense for an old dude. But BAM! Turns out grandpa was just smokin' the devil's lettuce. Get it? You probably don't, you're probably too busy eating crayons and sticking your fingers in light sockets.