Films with the theme ONE?

I host a film festival. It is actually just two friends who come to my home to watch about ten movies over three days. The theme I was assigned this year is ONE. So far I’ve come up with:
A Chorus Line ONE singular sensation
City Slickers. The secret to life is ONE thing
Rope ONE continuous shot
Cast Away ONE guy stranded
Touch of Evil ONE continuous shot in opening scene

But I’d really like some I haven’t seen. We are fine with subtitles and really anything but hardcore horror. We are also MST3K fans.