From a pure “oh, that’s cool!” perspective, the chapter on Chaining was a real eye opener. I’d looked at jQuery code, of course, but I’d never sat down to think about how he might have created the().ability().t0().keep().mashing().functions().together(). It’s diabolically simple in concept (return this!), but also mighty powerful. Again, it’s not one of the patterns I’m looking to adapt any time soon, but it was crazy interesting how simple it is in concept.