One of the first rules you probably learned when you played football as a kid was that you have to play the ball forwards when kicking off.
And that's why the start of the match between Spain and the Czech Republic left everyone thoroughly confused.
For a lot of fans it was a proper double-take moment.
But yes, as most people guessed, there has been a rule change.
It is one of a number of new rules brought in for the tournament, so also look out for players getting sent off before the start of the game. That'll really confuse people.
Of course, this kick-off business is old hat to fans of the England's women's team.
Trailblazers, those Lionesses.