Interestingly, if I think about a random coin presented to me, I think about the chances that it is biased coin, and dismiss them as most coins in the universe are not biased and most of observations of coins are observations of unbiased coins. So I use something like selection of my observation from all observations in the universe to get a prior about if the coin is biased. And I do it almost unconsciously, it is built-in calculation of what is normal.
Interestingly, if I think about a random coin presented to me, I think about the chances that it is biased coin, and dismiss them as most coins in the universe are not biased and most of observations of coins are observations of unbiased coins. So I use something like selection of my observation from all observations in the universe to get a prior about if the coin is biased. And I do it almost unconsciously, it is built-in calculation of what is normal.