This was a delightful story that managed to fit a ton of detail, description, and humor into only a few short words. I like the fact that the story started with Grandma hearing the joke and then devolved from there. It was a really effective choice in such a short piece to start things right off the bat.

My only (small) quibbles with the piece are that the reader never really gets a sense of what the joke was that Grandma laugh so much, and at the very end the story finishing with Grandpa's point of view felt like a bit of a deviation from what was otherwise Grandma's narrative for the rest of the story.

Overall, I thought this was a really fun, entertaining flash fiction story that has all of your usual humor and excellent technique. Nicely done!