You'd be amazed how a simple experiement can be fun. These guys work on this enormous vacuum chamber to build space ship things, and that's their day job. As in

You'd be amazed how a simple experiement can be fun. These guys work on this enormous vacuum chamber to build space ship things, and that's their day job. As in, at some point, it gets routine and a bit dull. (Ever find high power lasers boring? You will after your safety training...) Now, they are recreating an experiment last performed at this scale on the moon. It's an unusual break from the norm, and I'm sure half of their grins were the phenomenal waste of power to perform such a silly experiment. (Seriously, that chamber was hauled down to a couple torr in three zarking hours!) Professionally goofing off is immensely fun. (Tiddlywinks with a forklift would be another, and there was a guy who used the armor coating a Blackbird uses in a robot wars competition.)