The backpass rule is one of those that everyone knows about but you probably never see in action.
We had a real throwback on Wednesday, though, as Wigan Athletic's Jamie Jones simply picked up a back pass.
The goalkeeper was off having a drink of water when it was played back to him - he must have completely missed that it was his teammate who did it.
Jones picked the ball up and West Bromwich Albion won an indirect freekick a few yards out.
It's the kind of thing you'd see back when the backpass law was first introduced but it's pretty unusual in 2019.
The resulting freekick was shifted to Charlie Austin who smashed it home, equalising less than ten minutes after going behind.
It could prove to be a very important goal in the title-race, too, as the draw (it finished 1-1) keeps West Brom level on points with leaders Leeds United.
Jones better steer clear of Yorkshire if that point ends up making a difference.