When your organizing your work emails and you press M out of habit and wonder why the menu does not appear to move collection! Then gasp as all those emails starting with T just disappeared and now only display those starting with M.
Then realize, Doh! wrong program. I am now displaying all that start with M and did not move anything.
I actually did this today 
Had a mini panic until I realized what I had done.
And This is my story…