[FlagsAreFun]

I once took in a 15" MacBook Pro to get a SATA cable replaced (my own fault for rushing an SSD replacement and ripping the cable). While they didn't ask for my password, they did make me sign a document allowing them to wipe the drive if they felt like it. This is despite the actual service being purely hardware-related.

Sure enough, after a few days I get the laptop back to see the hard drive's been wiped, supposedly because there were errors with the OS installation, though there were none that I picked up actually using the device.

Not that it's possible with Apple devices anymore, but that taught me I should have just given them the laptop without the RAM or SSD installed at all.