Yes, DRIVER!! That was the best Easter Egg. You can play it here [1], Escape Control+6 after booting.
I loved that game so much as a kid. I made a clone of it as an entry to the IOCCC which won [2]. Sadly it no longer works in modern terminal emulators, but a slight modification [3] fixes it. Instructions here [4].
Aside, I got up to similar shenanigans in high school. Printed out "Y2K Compliant" stickers and stuck them on everything. My mother was a teacher so I did have access to a laminator ;) a privilege I left sadly underused.
Roland Gustafsson here: I had forgotten that I added that Easter egg! Yeah, that game was something I wrote for fun and just threw it in there. Every program I worked on back in the day had at least one Easter egg. Usually many!
Also, it was only the Apple II version that had Easter Eggs, even though I ported the C64 and Atari versions myself, that was my first experience with those machines so didn't have time to play around. I did the ports in record time, however, due to my abstracting all "system stuff" for the Apple II version, saved so much time with the others, didn't hurt that they were also 6502, however. :) I did not port the PC version.
I loved that game so much as a kid. I made a clone of it as an entry to the IOCCC which won [2]. Sadly it no longer works in modern terminal emulators, but a slight modification [3] fixes it. Instructions here [4].
Aside, I got up to similar shenanigans in high school. Printed out "Y2K Compliant" stickers and stuck them on everything. My mother was a teacher so I did have access to a laminator ;) a privilege I left sadly underused.
[1] https://archive.org/details/328_Print_Shop_Companion_Side_B
[2] https://www.ioccc.org/years.html#2001_ctk
[3] https://chris.pacejo.net/programs/ctk-fixed.c
[4] http://www.ioccc.org/2001/ctk.hint