McKay: There must be some kind of a command code that needs to be entered first.
Sheppard: Can you figure it out?
McKay: Yes, well command codes are usually quite simple like the number one or the letter A, like in Wraith... which could be...
Sheppard: Can you figure out the code or not?
McKay: No, not if I stood here and tried for a million years and we have... (looks at watch) just a million years less than that.