Posted in the other topic on this, but it probably isn't trivial when it is done live on TV and you don't get the most basic of basic laws correct.
I once did a contrib game with a referee who asked us in the tunnel if we had a coin. I'd forgot mine but offered to go back for one, he said no don't worry, so I'd assumed he was doing the what hand is it in trick. So you could imagine mine and the other assistant's surprise when he asked the away captain to call head or tails, knowing as we did that he didn't have a coin. He replied heads, to which the referee pretended to flick a coin and said "heads it is, your choice of ends". One of the funniest things I've ever seen. Home captain said "you can't do that ref", to which he replied "would you have changed end", reply was no, then "excellent, you get a kick off each so lets get on with it". Captains after that thought it was hilarious and the referee had no problems at all in the game. Crucially though, that wasn't on live TV, or indeed on any kind of TV.