The point I’m trying to make is that I am the most unpleasant, rude, ignorant, and all around obnoxious asshole that anyone could possibly have the misfortune to meet. I am dismissive of the virtuous, unaware of the beautiful, and uncomprehending in the face of the happy. So if I didn’t understand I was being asked to be best man, it is because I never expected to be anybody’s best friend. Certainly not the best friend of the bravest and kindest and wisest human being I have ever had the good fortune of knowing. John, I am a ridiculous man, redeemed only by the warmth and constancy of your friendship, but as I am apparently your best friend, I cannot congratulate you on your choice of companion. Actually now I can. Mary, when I say you deserve this man, it is the highest compliment of which I’m capable. John, you have endured war and injury and tragic loss (so sorry again about that last one) so know this – today you sit between the woman you have made your wife and the man you have saved, in short the two people who love you most in all the world. And I know I speak for Mary as well when I say we will never let you down, and we have a lifetime ahead to prove that.
Sherlock’s Best Man speech