I think this goes under the category of oops!

[AK ref SE]

We started a girls game out with a boys ball once. We walked out to the scorers table with the girls ball. We went over to the table to retrieve the ball for the opening jump and the scorekeeper handed us the ball. There was a boys ball under table also. We made it up and down the court a couple times before one of the girls made a comment. Now before I toss the ball, I look at it again.

AK ref SE