You just recently came out of the ruins and came to a strange bridge. There were footsteps behind you, when a strange man approached you, he said

Sans : "Human. Don't you know how to meet a new friend? Turn around and shake my hand."

You squeeze his hand and the sound of farting is heard

Sans:"Heh heh… An old trick with a fart pillow in your hand. Always funny..."

Sans:"I am Sans, Sans Is A Man."