1988 ish got back from a visit to the TT arriving after a wonderful time, very tired as i had travelled over night. My mistake was choosing this point to check that my Suzuki GS850 shaft drive did indeed have a head gasket leak. My method was to look into the source of the oil focusing in my tired state on the head gasket, up to the point my nose touched the hot down pipe. Not a serious injury but it was an embarrassing red dot on my nose for a week or there abouts.