1. Saving a few seconds at a long red light via elaborate and questionably legal maneuvers.
2. Having someone call your cell phone to figure out where it is.
3. Calling the Ackermann Function with Graham's Number as the argument just to horrify mathematicians.
4. Instinctively constructing rules for which floor tiles it's okay to step on and then walking funny ever after
xkcd definition by Urban Dictionary
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