Crazy as it seams ...I get Mad with having to answer questions like this...One should never ever self diagnose oneself and always plum for a second Opinion. :(
It's not at all nice...it's when one Scottish guy head butts another unsuspecting guy he's having an argument with......The scots are famous for doing it to each other when they had far to many Sherberts....
It comes and goes depending on the meds I am taking. LOL! I believe my papers were stamped "certifiable" upon exiting the womb by the same Notary Public who made official my birth certificate.