Yeah, this has happened to me. In fact, soon after seeing Waking Life, looking at my watch to see a similar warped digital image as yours, i triggered one of my few ever LDs. I similarly strongly recommend waking life, not just for its insights on lucidity, but simply as a good film. As one of the characters in that film explains, "fine print... very unstable man". The dream-realm's inablity to muster up fine print details in combination with our alterered-conscious state's natural nonsensical projection of time makes digital watches, clock, etc. very effective LD-triggers.