When I watch reruns of The Simpsons, I catch jokes or references that I did not get the first time. I realized recently that a big reason for this is not that I overlooked the joke the first time, but that I didn’t know the reference at all. I saw Dr. Strangelove a few weeks ago (yes, finally) and this week I saw part of the Simpsons episode where Homer starts a vigilante crime-fighting group. He is out buying supplies and envisions himself riding a nuclear bomb with a cowboy hat on. I did not get that the first time. So what else have I been missing?