Almost getting hit by a train, due to own stupidity.
Was walking along double set of tracks (was walking on M1, the left side set), and heard a train horn behind me. At first, I didn't think much of it, thinking it would be on the other set. But something in the back of my mind started shouting "GET THE F OFF THE TRACKS RIGHT NOW!". So I moved off the tracks, and not ten seconds later, a commuter train goes roaring past me on the tracks I had been walking on. I spent about the next five minutes hunched over, trying not to piss my pants in shock and fear.
Insert some witty line here