If you've spent the past year bragging to everyone you know about the barely used bowling ball you picked up at a yard sale for a paltry $5, you may want to avoid swapping stories with the two people who have unknowingly purchased original copies of the Declaration of Independence (an estimated 26 of them remain, and are worth about $2.5 million apiece).

In this week's all-new edition of The List Show, Mental Floss editor-in-chief Erin McCarthy is sharing 20 stories of yard sale and flea market finds that turned out to be worth a fortune. You can watch the full episode below. (And be sure to keep your eyes peeled the next time you find yourself sorting through someone else's junk.)

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