I suppose it's fun for the same reason it's fun to try to get non-Finns to appreciate salmiakki.

Oh, God I had this happening in class this morning. They were giving out free stuff outside, and a couple of Spanish guys had gotten some Salmiakki and were trying to eat it discretely in class. In the end one of them actually raised his hand and asked What is this "Salmiakk"?, The four Finnish girls in front of them and I just broke down laughing, they looked so totally lost. Totally not what they had signed up for poor guys.