0% probability is my most common answer as well, but I'm using it less often than I was choosing 50% on the CFAR calibration app (which forces a binary answer choice rather than an open-ended answer choice). The CFAR app has lots of questions like "Which of these two teams won the Superbowl in 1978" where I just have no idea. The trivia database Nanashi is using has, for me, a greater proportion of questions on which my credence is something more interesting than an ignorance prior.