Question for Unix/Linux/Android, is there a login that the password determines the user?

Example: a special password used under duress with the authorities over my shoulder demanding access, they get into the prepared account. If my usual password is entered, the system logs me into my normal account with all my gay. And a third "self destruct" password does a rm -rf in the background while a forever static login screen is displayed.

I'm surprised I've never seen this hack done yet...
#security #RubberHoseSecurity