Not obscure but a surprisingly low number of people have seen it: True Romance. My dogs name, Alabama, came from that movie.
One of my favorites of all time.
As mentioned above, if you haven't seen grandmas boy, its hilarious.
I mainly watch documentaries. Pulling John was OK (an arm wrestling doc) but if you like documentaries and haven't seen "King of Kong: a Fistfull of quarters", you're missing out.