Many Japanese have birthday parties for their pets. I have made some otaku type friends in Osu, the Nagoyan version of Akihabara in Tokyo, and was invited to a Chinchilla Birthday Party. This was a first for me and I am not sure if the Chinchillas got a lot out of the party but the guests sure had fun.
This is also my 100th post!
This party in turn inspired a similar parties in the future:
WereVerse Universe Baby!