Laughing?!

So, Trav and I have been trying forEVER to get Xander to laugh at us! and today I went to visit my cousin and her friends who are in town and he started laughing at her friend! A Total Stranger!! What the freak is that all about?? Well, atleast I got it on video and hopefully I can try her trick and he'll laugh at me, too. (She would just say, "Aaa... Choo!" and he'd laugh)