Unintended selfishness. What a knotty koan -- one that brings to mind the brisk and perhaps too-facile observation that "the road to hell is paved with good intentions."
My Zen teacher once observed, "Without ego, nothing gets done." Which raises the question, is there really such a thing as selfless accomplishment?
All I can think is that in order to be selfish, there must be a self and that this proposition is the proper venue for investigation.
Unintended selfishness: In attempting to do something good and selfless, the selfishness is as apparent as in regular old, me-first selfishness... it just doesn't attract as many critics.