To people who might experiment with this: Be careful! A teenager me, two decades ago, changed the shell of a system account to a joke program, and I didn't know

To people who might experiment with this: Be careful! A teenager me, two decades ago, changed the shell of a system account to a joke program, and I didn't know they could suspend that joke and grab a system subshell. Then again, learning one the hard way every now and then is a great way to boost your working memory.