It's funny, I barely did anything. Sans introduced me to him as 'the head of his fan club' when he caught me sneaking in. He's just one of those types that are really loud and friendly all the time I think. As long as you're nice to him and can stomach some weird food you should be fine.

... from how he talks I don't think he has a lot of friends. He's kinda like Gio- sorta overwhelming.