I'm an animation student, so hearing 8x08 was once titled 'Dean Amuck' actually made me squeal a little. I could talk all day long about how awesome 'Duck Amuck' is, especially in relation to SPN, but I'll refrain. If the writers use the main points of the cartoon short (which they totally should, it's built for a meta ep) then the thing sending Dean 'amuck' would be his arch nemesis. Daffy is sent on his trip by his cheif enemy Bugs Bunny. Who d'you think would fill this role for Deans version?