Jimmy Stewart plays the very amiable and frequently drunk Elwood P. Dowd. His best friend is a 6'3-1/2" tall rabbit named Harvey - who's invisible to everyone else. His sister and nephew are horrified when he comes home and scares off their friends by trying to introduce Harvey, so his sister attempts to have him committed. Accidents, misunderstandings, and comedy ensue.
I loved it in 2007, saying "A very goofy movie that doesn't say much or do much, but is immensely entertaining." It's still fun, but it's not one of the best of the old movies. I think my mild annoyance with it this time is that I don't particularly like Elwood P. Dowd - he's incredibly polite, but still a bit irritating.