For several years, Palantir's main product had, hidden deep inside of a stack of preference windows, a button simply labeled "Find Terrorist". It was a bit of an inside joke, since at the time the software was treated as a magic box that solved all your problems, and when it was still focused on government use cases.

but you know who doesn't joke around? The government doesn't joke around. So yeah, as soon as it was found by a user, that button was immediately removed. It's just a shame that some contexts are deemed "too serious" for an obviously lighthearted addition with no real detrimental effects.

At least some software has managed to maintain their humor, like Phabricator - https://www.phacility.com/phabricator/