The method is super simple!!!
Just send this link via MSN for him to click:
http://minisite.youku.com/msn9/dlpic.php?pid=406
(This is Youku's link, guaranteed safe and non-malicious)
Then................
Check his MSN avatar, it should have already changed to the "Auntie Kiss" animation!!!
Isn't it fun?
Note: If using MSN8, the auntie will be static and not moving.
Also, if your friend does not open the link with the IE browser, it may not work.