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Over 30 years ago, when a Systems Analyst, in a productive shop, we had many, many opportunities to 'prank someone'. Each took time, and creative energy. Let alone the risk of impacting a fellow worker, losing team trust and always looking over your own shoulder.
I'm impressed by any pranks that take very little time, are not likely to 'hurt' and/or may educate - example 9: Hard drive transplant and 'Lock your PC'.
What have you been coding your time to?