Docs say Yubikeys are water and crush resistant, and
viewtopic.php?f=12&t=1379 shows scratch resistance. What about bend resistance?
Do you collect user-reported modes of accidental destruction? And whether it was possible to repair it enough to use one last time.
Also for the cases where the owner needs to destroy it reliably: what works, and how toxic are the fumes & ashes from burning one? (asking for curiosity, not because I ever expect to need to myself)
Seen: "How do I store my YubiKey?" of
https://www.yubico.com/support/faq/ and another about driving a car over it.