You will get two warnings about chimping the flippers before the penalty kicks in. It is the narrator who heckles you, not the chimp, given his condition his voice would be so high you would need hear it over the game play.
Once the penalty kicks in, the chimp will be smashing the cymbals very fast.
The penalty will reduce the jackpot and super jackpot values by half.
Once the penalty kicks in, it remains for the rest of the of the multiball. However, I will consider enhancing it to have the penalty removed for good behavior and/or adjusting how it handles a stacked MB.