I've noticed that this isn't the first post about The Simpsons here, and I'm not positive that the diaper reference was deliberate.
In an episode called "Dark Knight Court," at the very end, they talked about a group of octogenarian heroes they called "The Dependables." The "Depend" reference when talking about senior citizens seemed too much like a coincidence to me. Anyone else suspect this was deliberate?
BTW, you can see a relevant portion of the episode here: The Simpsons: The Dependables from "Dark Knight Court" - Videos - MetaTube