One of countless possible EFFECTS:
You display a 4-digit Master® adjustable combination lock that has 10,000 possible sequences, set the lock to a number that only you know, and then mix up the dials. A spectator inputs as many combinations as they'd like—proving that the lock really is LOCKED, and that not just any 4 numbers will open it.
The spectator chooses 4 random audience members, who each call out ANY number between 0 and 9. There are no forces or influencing of any sort, and during this time, the spectator has been holding the lock on stage while he/she dials in the 4 numbers that are announced.
Then to everyone's complete astonishment, the spectator pulls on the shackle and the lock opens with a resounding "click"—an amazing climax that will leave your audience stunned!
Imagine these other possibilities:
Picture being able to read 4 members of the audience's minds, and have their randomly chosen numbers open the lock...Or approach a group at a table and explain that you set the lock to a prediction, and then reveal that a spectator's 4-digit secret pass code to their phone is the only number that unlocks the lock...Or have an audience member's favorite moment in time (past or future) be the only sequence that will open the lock!...The incredible possibilities are truly endless with "T.U.R.N.", and that is why we call it The Ultimate Random Number Lock (T.U.R.N.).
Details to remember: