" "The TARDIS!" Even though it's a serious moment, I laugh every time the Doctor embraces the TARDIS in joy. I love Sexy. River and the Doctor are my OTP, but the TARDIS and the Doctor are also my OTP.
Also, that awkward moment you find out your wife was conceived in your spaceship during her parents' honeymoon, which was your wedding gift to her parents, who are your best friends. Never apply logic to Who.