If you buy used instruments online, you know this scenario. The box is delivered. You eagerly open it and pull out a case or gig bag with your new used bass inside. You examine the bass, play it, adjust the action and intonation, maybe install your strings of choice... And finally, when you're satisfied with the bass, you turn your attention to the case or bag it came in. At that point... What's the weirdest thing you have found in a pocket, left there by the previous owner, that you didn't expect to find?