Marius and Courfeyrac met because Courf tried to say hi to Combeferre in passing one day, and Marius accidentally thought he was talking to him.
Marius stared at him for a couple of seconds trying to figure out who he was. Instead of shrugging it off or awkwardly waving, Marius grabbed his face and yelled “I don’t know you. I want to, but I don’t.”
Courfeyrac laughed so hard that he gave Marius his number anyway.