If you didn't know anything John Ritter was in, you are missing out. From Three's Company, the sitcom that taught me to pinch asses, to movies like Stay Tuned and Problem Child, which will forever play on cable TV. John Ritter also was the host of many 'Worlds Greatest Magic' shows on TV as well. He was a great comedian and was loved by the TV community. He will be surely missed. John Ritter passed at age 54. CNN story here 