I will sometimes randomly sometimes start sort of half-singing, half-humming Orbitus(That part with the voices).
Also, JCS was one of the first Level Editors I could use properly, so learning to use that was quite useful.
Jazz 3D was the first unmade game I was ever really curious about.
And, Jazz 1 is the game I'm most proud of owning(I went through a lot of trouble to get it, and it's quite rare now, from what I can tell).