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by norvig 4695 days ago
When I was in grad school a friend in another department said "You guys in CS have much nicer printers; can I mail you my thesis and have you print it out? And how would I mail it?" I said "Sure; Just do 'mail me@school.edu less-than-symbol filename". Later he calls in a panic -- "my thesis file has disappeared! I did what you said ... oh, wait a minute, I might have done greater-than instead of less-than..."

Fortunately for both of us, he had been diligent about making backups and din't lose his entire thesis.