Fefer-Ritterstein Paradox
Imagine some phenomenon that is only sustained by some fact (eg a relationship that only continues because two lovers eat Thai food on Friday nights). If the fact is an essential part of the phenomenon (ie there would be no relationship without the Thai food), what explains the phenomenon's initial emergence?
Edwin and his friends only discuss past night's drinking. What, then, did they discuss upon first meeting if there were no past night's of which to speak? This is a Fefer-Ritterstein Paradox.