Groundhog Day is a funny one for me too. Every time I see it, it doesn't strike me as profoundly as it did that first time I saw it. Which is kind of ironic given the nature of the film. If I thought the director (Harold Ramis) had intended it to have effect, I'd call it a work of genius!
But it did start me on the trail of Bill Murray. For which I'm thankful for. Oh, and BTW, 'Ghost Busters' would be a favourite film of mine too... but it didn't instantly come to mind, I needed reminding. That's favourite for you.