In the "Smack!" scenario, I had a rather nasty tendency to spin up the docked DGs just for the fun of it (> 5RPM), then undock and watch the partner DG spiral off in orbit after I stopped my own rotation.
In the same scenario, I would sometimes also deorbit both of us and only undock at entry interface, and watch the partner disappear in its own fireball.
I think I did it was mostly because I knew what I was doing was almost definitely fatal for any crew on those DGs, but almost definitely because I didn't have a good sense of how to fly a DG (spin-ups and firing the main/hover engines was all I could do back then) or any spacecraft in Orbiter in general...
...which, unfortunately, is still a problem I have today.