Cook a crêpe on one side.
Loosen the crêpe from the pan with your spatula/pancake turner.
Hold the franc/coin in your weakest hand (for example, the left if you are right-handed), when the crêpe is ready to be turned.
Attempt single-handedly to flip the crêpe.
Enjoy good luck for the rest of the year if the crêpe lands perfectly in the pan. Suffer bad luck if the crêpe does not land well - or try again!