Obscure Performances in Obscure Plays which Rocked Your World

Trying to stay away from the obvious, here are some of mine:
Eric Roberts in Burn This
Jesse Eisenberg in Scarcity
Kristen Johnson in Scarcity
Christina Kirk in Gods Ear
Penny Fuller in Beautiful Child
J Smith Cameron in Boys Good And True
Michael Shannon in Bug
Jermemy Shamos in 100 Saints You Should Know
Deirdre O'Connell in Pyretown
Dane DeHaan in End Days
David Wison Barns in Becky Shaw
Patrick Breen in Next Fall
Cristin Milotti in Stunning
Josh Grisetti in Enter Laughing
Tobias Segal in Up From Here

And Duets:
Rosemarie Dewitt and Adam Rothenberg in DannyAndTheDeepBlueSea
Sarah Paulson & Jason Butler Harner in TheGingerbreadHouse
Liz Marvel and NorbertLeoButz in 50 Words
Jennifer Mudge & BrianDarcyJames in The Pavilion
ThomasJayRyan & Michael Urie in The Temperamentals