An Unusual letter, certainly over-Used by people across the pond. : )
No offense, after all, we Americans just borrowed your English language and tweaked it a bit!
Wracked my small brain to find anything Useful to put here. My first thought was a comedic actor in some series somewhere that would often exclaim “Unbelievable!” but I couldn’t remember who it was to find him.
So this is it people, no outstanding Use of U.