Just thought I'd drop in and share something that Kaicho's picked up lately. It happened because I'd randomly say his name (strange as it is) around him in a sort of rhythm, then he suddenly started to create his own beatboxing song out of it. Now, it's a trick, and I simply just bob my head and he'll go right into it.
Hope you enjoy it (all my friends do, hah).
(oh, he also does super mario brothers mid-way through the song... not que'd by me).