Stargate: Atlantis2004

Dr. Rodney McKay:
Genii. They must have discovered the place, started messing around with the machine without having the first clue as to what they were doing. Which explains why the place is covered in this. [indicates organic material]

Teyla Emmagan:
And before the realized what they'd done ...

Dr. Rodney McKay:
They couldn't figure out how to turn it off, so they shot the thing, hoping they could somehow kill it, which only made it regrow more, make it that much more difficult for someone with the ability to actually turn it off *to* actually turn it off.

Lt. Colonel John Sheppard:
So you can't actually turn it off?

Dr. Rodney McKay:
I never said that.

Lt. Colonel John Sheppard:
Well, what *did* you say?