Worst Practical Joke Ever Pulled: Hmmm .. this one will take a little background explanation to understand. At a National Laboratory at an undisclosed location, there were Ironworkers, Boilermakers and other crafts hired to perform the usual construction tasks needing done. Now, at this job, there was a possibility of exposure to internal uptakes of transuranium isotopes. To monitor for this required a weekly submission of a bioassay sample for testing. As you can imagine, a crusty craft person did not much care for having to bag a weekly sample of his Porcelain Throne sitting time to turn over to the Technicians for analysis. One day, this Craft worker asked the Lab Tech: Just what do you do with this crap anyway? The Lab Tech, actually having someone ask about his job went into a lengthy explanation of how they bake off the moisture and perform a Gamma Spectrum analysis for energy peaks to determine what if any and how much body burden from radioactive isotopes was present. Now, the Craft person did not understand any of the energy peak explanation, but did hear the oven bake off part of the answer. So, before the next weekly sample submission, the Craft(y) person managed to ingest a sufficient quantity of Orville Redenbachers popcorn in the un-popped form. The resultant oven cleanup did not amuse the Lab Techs. What practical joke do you know of to top this one?