Before a match, the first formal interaction soccer referees have with team captains results in a coin toss. Based on the Laws of the Game, Law 8 states that:
"...the team that wins the toss of a coin decides which goal it will attack in the first half..."
If you dig in your pocket and have no coin, and your referee team comes empty handed expecting you to carry a coin, the situation can be quite embarrassing for the assembled group. Players are eager to play and gain what they consider a starting advantage. Assistant Referees may be expecting the referee to carry a coin. The formality of a coin toss exhibits a 50/50 chance for the players, and that the referees are applying fairness to the match.
There are a number of tricks referees use for the coin toss. These work at the youth, college, indoor, beach, adult, and professional levels.