We humans love to sniff food and declare it safe. But with cut watermelon, the smell test is a lie. Harmful bacteria don’t always make food smell funky. Your watermelon could smell like a summer dream and still be full of germs.
Instead, use your clock and your brain. If it’s been more than two hours out, don’t gamble. Treat it like that pair of socks you left in the rain—you could try to wear them, but why would you?