Hmm...maybe It's a mistake

Yes, it's a mistake. I know it's a mistake. There are certain things in life where you know it's a mistake, but you don't really know it's a mistake, because the only way to really know it's a mistake is to make the mistake and then look back and say "Yap, that was a mistake." So, really, the bigger mistake would be not to make the mistake because then you'll go all your life not really knowing something is a mistake or not. (Lilly Aldrin, How I Met Your Mother, Season 1, Ep.21)