I take issues with the very last comment (note: the he/she thing was obviously a typo, so I'm not addressing that) -- you clearly haven't taken an engineering ethics course. Classic examples:
1) Let's say you created a regular looking chair and state on a big tag attached to the chair, in bright red letters, "you can only sit on this chair and this chair isn't designed to be stood upon". If someone later stands on the chair and it broke, then you, the designer/manufacturer/whatever, are still responsible for the injury in the court of laws. "Foreseeable misuse" is what engineering ethics call it, and you're at fault.
2) If a ceiling fan hits a baby while a parent is throwing the baby up and down, it's not a "foreseeable misuse", and the parent has no grounds of suing the company that made the ceiling fan.
IANAL, but it's pretty clear from planking and past social network-inspired activities that such a "speeding trophy" falls into category 1 (from my perspective, and probably most jurors).