It's a brilliant conversation starter, I do believe I have used it before - not because Sherlock did, but because it's all I could think to say. I'm not exactly great at small talk…haha <-- pretty sure this is a sheldon cooper quote actually
John is Sherlock's much needed social compass--and it's a job he took on willingly and immediately. He helps Sherlock navigate the world without shaming him in the process. John is the heart to Sherlock's brain.
"I suppose this happened very early on in their relationship, before John knew Sherlock well enough to understand how much this would hurt his feelings, but I still get a little mad at him every time I watch this scene.">>> jawn be nice!