Also you can do it in a non-destructive, non-random way. Take `apt` as an example. The easter egg is running it with an undocumented flag. The "error case" is

Also you can do it in a non-destructive, non-random way. Take `apt` as an example. The easter egg is running it with an undocumented flag. The "error case" is the same as mistyping a command. Sure, you could argue the return code is 0 when it should be != 0 but I'd argue a) if you're using the wrong flags it's your fault and b) if you'd hit --help by chance it would also return 0.