I saw a chess shot in the newspaper the other day, some big comp and they were using the old mechanical clocks - none of the digital rubbish.
I was playing lightning the other day on a digital, very fastly I must add, and lo and behold (again) I was not using any time. Over 15 moves I still had 5 mins on the clock. When I queried I was told that if your move is under 2 secs or something it does not register or you get a bonus or something. what is that about? Talk about polluting the meaning of lightning!!