Signatures do seem to be potentially inflammatory, anyway. It's as if the signature is the personal part, and carries more weight when one uses it as a stage for one's opinions.
My approach is to split my sig into two self quotations, intended to represent the ego and id of my personality. The ego has a grandiose metaphysical statement which never changes, although his identity is changed frequently. The id retains a constant identity, but has a diffrent Zen-type riddle to pose...
The basic idea is, no one can argue with something that's TOO far out there! If I make it obscure enough, I can say anything I want...
"The entire universe is simply the fractal chaos boundary between intersecting domains of high and low energy."
--Imladil the Hominid
"Why are we here?"