by Part-Timer » Feb 18th, '10, 09:16
So, which is it? Mentalism, two to three minutes or a routine? To paraphrase a popular maxim about projects, you can have any two of those three! I thought that you might have meant trick or effect instead of routine, but you also referred to a finale.
Take a look at your 'requirements' and consider if they are realistic for a three minute spot - the time it takes to soft boil an egg.
I assume this is for a talent show, or an audition of some kind, rather than close-up, because of the various conditions you have named.
Anyway, in an effort to be helpful, I shall suggest a magic square, based on a two digit number chosen by a spectator, but unknown to you. Highly visual (you construct a magic square on a flip chart on stage), impressive (especially to anyone who isn't a maths whiz, or a magician) and with a surprise finale, that the lines add up to the unknown chosen number.
It might be a struggle to fit that into three minutes, with appropriate presentation (displaying your natural charisma and ability as a performer).
Another broad type of effect you could consider is a drawing duplication. There are many ways to do this, of course. If you stand back-to-back with the participant, you can save a bit of time, and make it visually more exciting. There is also a visual finish, when the drawings are displayed.