Negation and Rasputin

I was just organising my desk space, when I found this jotted down on the back of a piece of paper:

"Negation is the Rasputin of predicate calculus"

I didn't write a name for who said it, I don't remeber where I read it, and actually I am not sure what is the intended meaning! (probably because me and logic don't get along very well)

Mai