Björk. Back in the nineties, she had a stalker named Ricardo López. He got angry when she started dating a black man, so he made an acid explosive (and filmed himself naked for 20+ hours while making it) then sent it to her in the mail. He painted himself red and green then ended himself in his apartment. Four days later his friends found him, saw what was on the tapes, and the police intercepted the package en-route. Björk kept making music, but she was so shaken by the incident that she stepped all the way out of public life.