I'm gonna go out on a limb here and say that I think Morgan Freeman might kinda hate Jimmy Fallon. It could also be that he kinda sorta hates everybody though; he is 77-year-old black man who grew up in Memphis during the civil rights era, after all. So the surly attitude is understandable.
Jimmy Fallon was able to convince Freeman to do part of his interview on helium, altering his famous voice to more of an oompa loompa tone. Maybe Morgan Freeman can now re-record all his lines from Shawshank Redemption on helium, that wouldn't be asking too much would it? *Takes hit of helium* "Hope is a dangerous thing. Hope can drive a man insane."