NASA Astronauts Brought Playmates To The Moon -- Discovery News
When NASA sent its Apollo astronauts to the moon, it sent them with "cheat sheets" -- wrist checklists attached to their suits that outlined the main stages of surface activities for each extravehicular activity (EVA).
But like all flight hardware, crews didn't train with their real checklists; they trained with a copy and only signed off on the unassembled flight version. Assembling the checklist fell to the backup crew, and also gave them a great opportunity to sneak practical jokes into the mission.
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My Comment: Boys will be boys.