So recently an uncle of mine gave me all his NES games... which, he only had three that he considered his.
One of them, Iron Tank, was one I had played as a kid at his house and honestly wanted to revisit.
But this uncle sucked at taking care of stuff. I had to massive clean this thing, and even then it still glitched like a mofo... random lock-ups/resets and the like.
But here's the best glitch I got:
I started the game... and immediately got a cutscene I had never seen before about how the enemy forces signed a surrender document. And then the credits.
My reaction?
"Well, I didn't expect to beat this game so fast!"
Best glitch ever.... and the game has not glitched (in my experience anyway) ever since.