When picking a watermelon, I look for dark green stripes.
A yellow spot on the bottom is important. It lets you know the melon sat in the field long enough to ripen.
Examine the stem. If it is brown and dry you'll know that it was on the vine until it ripened.
You can thump it if you like, but really - what is it supposed to sound like? Thumping just gives you something to do while you're standing there.
Cut the watermelon and remove the rind before you chill it. It'll taste sweeter than if you put the whole melon In the fridge. Captan K, aka "The Watermelon Man," taught me this many years ago. Enjoy!
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