My most recent "meh" styled F# script had to parse 16MB of ugly XML that contained values which even unicode did not define. The goal was to create a lookup structure based on this data that could then be used from C#. I used seq expressions for cleaning up the input stream, active patterns for parsing the XML, but felt that I had no other choice than to use classes with dictionary members for the lookup data structure. With well over 100,000 items to organize and store, I did not want the overhead of creating a functional structure that would then have to be converted to nested Dictionaries for C# use. Anyway, at that point it became kind of pointless to try and avoid an imperative approach to populating the data structure.