All these
methods require more than one person. I have a
crude and unfortunately not very
effective method for a single person to make a
choice with
2..N choices available (for
small values of
n anyway). Though not a good method, it is
better than none.
The way I do it is thus; first I hold up a hand showing the N fingers (you may already spot a limitation with my system).
Now choose one randomly.
Before you all shout, "Charlatan", stop. This is just the seed value.
Now you need a nursery rhyme, some song lyrics or something similar. Sing or speak your song/rhyme, while counting through your fingers. Count a finger per each syllable or maybe word but take care not to count on each beat - this is rather predictable and will ruin an already poor algorithm.
When you reach the end of your little sing-song you will have made your decision.