The Internet Oracle has pondered your question deeply. Your question was:
How do you keep a rhino from charging?
And in response, thus spake the Oracle:
Reverse the polarity of his terminals.
Nova: You're a worthy adversary, Misho! But even you could not anticipate that I would invert the photon charge of the deflector array... AGAIN.
Misho: SOL DAMNIT THAT SHOULDN'T DO ANYTHING EVEN IF IT IS POSSIBLE!
Really shouldn't have taken me that long just to reverse the polarity...I must be a bit out of practice.
- The Tenth Doctor, Doctor Who, "The Lazarus Experiment"
Eleventh Doctor: Reverse the polarity!...It's not working.
Tenth Doctor: (annoyed face)...We're both reversing the polarity.
Eleven: Yes, I know that.
Ten: There's two of us. I'm reversing it, you're reversing it back again. We're confusing the polarity!
- Doctor Who, "The Day of the Doctor"
Kurt: Why would it work this time?
Brian: I've reversed the polarity.
Brian: Changed the wires round.
— The Teachers blow up a kettle, episode 3.06.
"The importance of reversing the polarity is literally the first thing they taught you in vague science!"