My favorite one is "thinking outside the box". It is unlike any jumping rubber band out there. It
is quite visual and has spectator participation. It just seems so impossible - even when you know
the secret.
You may have some difficulty is you have windows between your fingers,
but
once your fingers get accustomed to the position, I don't think it will be a problem.
The
set up is done right in front of the spectators and if done fluidly, they shouldn't suspect much.
The angles are ok and once you're in position, the angles become much better.
I also
suggest getting Joe's rubber bands - they stretch well, are colorful, and last longer.