Amy Farrah Fowler: So are you feeling okay? No wedding jitters?

Sheldon Cooper: No. There is nothing in the world that would stop me from marrying you tomorrow, even me from the future coming back to prevent the wedding and the subsequent birth of a child who will destroy humanity.

Amy Farrah Fowler: Because if you came from the future, that would mean you already went through with the wedding because you believe that time travel is on a closed loop.

Sheldon Cooper: I love you so damn much.