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How about the "Drop it off and Run"

Leaves a voice mail saying they have an issue and will be dropping their machine off. You arrive in the morning to find the machine on your desk with a note saying it doesn't work but there are no contact details on the note or on the Voice mail. Having spent hours fixing a completely screwed up system and restoring any data that you can you then call the user who logged on last to the machine to get a reply of "Well it didn't work so my boss bought me a new one, I don't need it now so you can have it".