I've NEVER (not even a U5 rec game) seen teams NOT switch sides at half time. For the coin toss, I like to be clearer than most because I find kids to be confused when a referee just says...."Side or Ball" or even "Pick an end". The kids are always like "what?" Are the kids assumed to know that you are asking which side to "attack" or are you asking them which side to "defend" or something else? So I ask what the law says, "Would you like to choose which goal you would like to attack in the first half or would you like to Kick Off instead?" It's very clear to the kids. When doing the coin toss, if there is NOT a HEAD on the coin, I don't ask them to pick "heads or tails". So many refs have these commemorative type coins with a some logo on one side and something else on the other. They'll say...OK, this picture of the Capitol Building (or something) is Heads and this picture of the Statue of Liberty (or something) is tails. The ref flips the coin and no one remembers what the hell the ref said was heads and what was tails...including me. The kids have no idea if they won the toss or not. They just take the referee's word for it. If I have a "real" coin with a head/face on one side, then I will ask "heads or tails". Otherwise, I will say..."Black or Gold" or "Red or Silver", because they are the coins I have an like to use. I understand that there can be color blindness issues but I haven't had that yet. I just ask if everyone can see that this side is "Red" and this side is "Gold". I also have a 50 cent piece as well that actually has a head on it so, if I use it, I will ask "Heads or Tails". Lastly, once I did a game and the center referee did the toss. One team won. And he asked, Ball or Side". They captain choose, side. He said to the team that did not win the toss "OK, you will be kicking off this way". The captain of the team that lost the flip said, we don't want to kick off first. So the center referee asked the winning team if they wanted to kick off first as well and they did, so the ref gave the KO to the team that won the toss and picked the side. I was like....what did I just see. : )