Seen speculation Nolan nicked the idea from Pynchon as there's a copy of GR on someone's shelf in Interstellar and you get the following toward the end of the book,
"...Part of a reverse world whose agents run around with guns which are like vacuum cleaners operating in the direction of life -- pull the trigger and bullets are sucked back out of the recently dead into the barrel, and the Great Irreversible is actually reversed as the corpse comes to life to the accompaniment of a back-wards gunshot (you can imagine what drug ravaged and mindless idea of fun the daily sound editing on this turns out to be). Titles flash on..."