They say he appears once a year at midnight on Halloween. His need for cupcakes prevents him from leaving this world and going on to a blobbier place.
This is not the same hoodie as the "When in Doubt, Blob" or "May the Blob Be With You" hoodies. It's a little thicker and likely a little less soft.
The inside of the hoodie may shed little fuzzies, but this will go away after washing.