There is something really exciting about C#, the way it handles closures.
Instead of copying the stack variable values to the closure free variable, it does that preprocessor magic wrapping all occurences of the variable into an object and thus moves it out of stack - straight to the heap! :)
I guess, that makes C# even more functionally-complete (or lambda-complete huh)) language than ML itself (which uses stack value copying AFAIK). F# has that feature too, as C# does.
That does bring much delight to me, thank you MS guys!
It's not an oddity or corner case though... but something really unexpected from a stack-based VM language :)