Along similar lines, a company I used to work for had a command-line tool called "metalink". If you mistyped it as "meatlink", your screen would fill with an A

Along similar lines, a company I used to work for had a command-line tool called "metalink". If you mistyped it as "meatlink", your screen would fill with an ASCII-art rendering of the Japanese kanji meaning "meat", along with the legend "meatlink - the tastier alternative to metalink". (It would then go on to invoke metalink.)