My Blackhole FDW talk seemed to go well. The line about no unintentional data loss got the best laugh. Here are the slides.
Besides being a bit of fun, this did have a serious purpose - creating a skeleton for building an FDW, including the writable API. The code has the contents of the docs on writing an FDW as comments in the appropriate functions, to help a new FDW writer.
The code is on bitbucket.