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Take a tennis racket,
hollow out the handle,
insert a vibrator that has a remote control
and now effect the outcome of your favorite sport from the sideline
||That one might actually have multiple uses....not sure if a vibrating tennis racket will deliver more or less power to the ball, probably depends on the vibration mode of resonance and the vibrational phase angle at the time-moment of collision. Anyhow, [+] for anything that vibrates that is supposed to.
||thought it was a RSI reliever.