Do you remember what happened on June 3rd, 1986? How about April 19th, 1994? If you're Marilu Henner you do. The actress is one of 12 people in the world who has been diagnosed with hyperthymesia, which is also known as Highly Superior Autobiographical Memory. Basically, Henner can recall every single day of her life.Henner, who is probably best known for playing Elaine Nardo in the hit TV show 'Taxi,' can recall the exact moment when she got the part.Henner said:'It was June 4 of 1978. It was a Sunday and I found out at the 'Grease' premiere party. 'Taxi' is so vivid to my mind. The very first rehearsal was July the 5th of 1978. That was a Wednesday and our first show was shot the 14th, a Friday.'.