I think there’s two different lines of approach to this thread; I took it to mean ‘films that aren’t appreciated or as highly thought of by the general population as they should be.’
I suggested Magnolia because your average person on the street will probably not have seen or heard of it, but...
I’d never generally recommend people start with live videos when getting into bands, but their Town and Country gig of 1988 is wonderful.
My favourite band, they should have been bigger than Nirvana.
As to avoid completely turning this into a Pixies thread though, my other top 3 would be a...
1) Simpsons
2) Parks & Rec
3) South Park
4) Always Sunny
5) WWDITS
My top 5, that absolutely nobody asked for. Seasons 3 - 8 of The Simpsons is the greatest TV ever made, alongside The Sopranos.