Final draft of what would eventually be a four foot tall masterpiece. Having him take his head off seemed more Haloween-ish.
I think he did it in the cartoon in some sort of Hamlet "Alas, poor Yorik" bit. That might have been Daffy Duck, though.
When you've watched as many cartoons as I have, they start having unintentional cross-overs a-la Flintstones Meet the Jetsons.