Hormones, Surprise Pregnancies, and Giving Birth.
ROYAL OAK, MI - FEBRUARY 1: (L-R) Bass guitarist Cliff Burton (1962-1986), drummer Lars Ulrich, vocals, guitarist James Hetfield and guitarist Kirk Hammett pose for a studio portrait during the Ride the Lightning Tour at the Royal Oak Music Theatre on February 1, 1985 in Royal Oak, Michigan. (Photo by Ross Marino/Getty Images)
Drummer Charlie Watts of rock & roll group The Rolling Stones performing on music programme Ready Steady Go! in London, circa 1964. (Photo by TV Times via Getty Images)