Because he needs one.
Seriously, most of the Jackie Chan Adventures stamps are of the talismans! Not about that whacky uncle!? BLASPHAMY!!
For you fellow Uncle fans out there!
EDIT: Thank you for all the faves, it's very much appreciated! If you liked this stamp, please take some time to browse the rest of my gallery; I have more than just stamps there!
Uncle (c) Whoever created Jackie Chan Adventures
Stamp (c) Me