Well once again there have been many thoughtful replies to both the original question as well as the followup with hints.
Recall the original question asked a bit of trivia: could you name 5 implementations of GetHashCode in the framework that do things you might not expect to see in a hash function? It's a little bit of a vague question and also requires a good deal of arcane knowledge of the CLR. The most interesting thing about the discussion I think is just what people considered "unusual." But as always there was a method to my madness.
So without further ado here's my list of "unusual" hash functions, there are 53 of them.
