i probably wouldn't do anything with it as i'd be too afraid of getting it damaged and then owing hella fees to the rental place. actually maybe that's why it's free, bc they know everyone wants to key these fuckers and then they can charge you for it 
Yeah, "rent" the worlds most recalled vehicle? This is a scam to leave your friend holding the bag on a shit car they can't move.
Sorry, bud, the truck came back slightly damaged ^[factory new cybertruck] and the contract states you now have to buy it from us.
Seriously, READ THE CONTRACT THOROUGHLY or DONT DO IT AT ALL
Sorry about what happened(s) to your friend
take it through a car wash
Slice vegetables with the sharp metal edges
The sharp edges are the vegetable peeler function. The automatic closing trunk is for slicing.
Do a tear down for vulnerabilities. Figure out the exact angles of camera coverage. Document any default passwords for WiFi or Bluetooth or whatever. If it does have built in wifi, run a port scan or whatever. look for jtag interfaces and dump any firmware you can.
Don't drive it anywhere. Just do silly videos for tiktok or youtube. Use it as a prop for satire.
piss on it
A couple ideas come to mind:
Caveat: these may be against the agreement, so make sure you can't be sued for doing whatever it is you do
Hauling a lot of weight will probably rip something off of it if not split it in half.
Bingo!
Turn it into a technical
If you absolutely have to, watch anime in the front seat on the screen and nothing else.
I'm sure there's questionable places to park the CyberTruck and, ya' know, let nature take its course.
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