 You can? You can tell how hard they are by eyeballing them? Pretty effectively. I'm a big blueberry consumer. Which fruits do you thump? Thump? What are your thumpable fruits? A watermelon and a muskmelon? People hate when I say muskmelon. Elon and muskmelon. It's cantaloupe for the rest of you, I guess. I know I've long found pineapples to be a bit of a challenge and avocados.