A person who tosses a coin to make it stand up.

Because coins have only heads and tails, after throwing coins, they are either heads up or tails up, so for Xiao Ming and Xiaoyan, the chances of both sides are equal, so the rules of the game are fair to Xiao Ming and Xiaoyan; However, the thrown coin is difficult to stand up because of its special shape, so this game rule is unfair to Xiaojun; Therefore, the judgment is: wrong.