Paradox

If I could change One thing, I would change the Fifth word of this challenge and make it Two. Then, I could change Two things, out of which one would be changing the Fifth word of this challenge back to One. So, I'll still be left with Two things (one from the new challenge and one from the first change) and out of those two, I'll keep one for later and use the other one to change the whole challenge to something else, although I'm now in love with this challenge. :)