I am looking for a movie where someone dies (I think in a car accident) because of small unrelated events. I think someones girlfriend dies and the narrator (the boyfriend??) traces it back. It had to do with someone running late and therefore forgetting to tie his/her shoelaces and therefore bumping into someone, and then someone missed a taxi or something.
This was not the movie plot, just a small part, but I cannot remember/find the movie and I need to know it for a peace of mind haha.