Rift in time at the dentist

[Screamadelica]

I went to the dentist for a check up a few weeks ago and was running a little late, so checked my watch as I arrived. 11.07am. Then sat through a painless one hour appointment and as I was about to leave the surgery I checked my watch again. 11.07am. Except that the watch was still working, battery was recent and its a good brand. I also tend to only be able to wear watches for a short time or they tend to stop. Like wise if I leave them on the bedside table. Theories anyone? Over to you, raaaid!