I was watching Memento last night on Film 4. Saw most of it before I started to nod off ... on .... off .... etc. Woke up when the very last scene was being shown ........ the guy drives past a tattoo shop, puts on the brakes, looks at what he had written down (the licence plate number) and obviously is deciding to go and have the number tattood on his arm/leg. (This, presumably, is actually the beginning of the story, in that the film went from current time backwards). But I missed a bit before that (the most important bit I expect) and I'm completely lost. Was Teddy the culprit?? I remember 'coming to' at one stage and Teddy was saying something about the whole thing maybe just being a test to see if the main character really HAD short term memory loss (or was just pretending?). I think he even suggested that main character's wife might not be dead?!! At another stage I woke to find Teddy had lost his (keys?) and main character was driving off. Then the tattoo shop, then the car brakes, then THE END. Who was the killer?