GM rolls and Twists

I was running some dice tests on my table via GM rolls, more due to boredom than anything else. While I didn't keep an exact count, I rolled somewhere between 70 and 100 times. Out of all of these rolls, not once did a moon or a skull appear. I'm not sure if this is a bug or intentional, but I'd think GM rolls to randomly decide something the players are not privy to should have the chance for good or bad twists.
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After reading this, I also tested it, and did not roll a moon either. I think it could be a fun thing to include moons and skulls in GM rolls, as it would add more variation to the games being hosted.

I agree, that's probably something I should add.