The Burglar Alarm

Holmes is at work when he receives a call from Watson, informing him that his alarm has gone off.
Holmes thinks it is likely that the alarm really went off, although Watson sometimes play practical jokes.
Holmes is on his way home when he hears a report on the radio, that there was an earthquake in the vicinity.
Since the burglar alarm has been known to go off when there is an earthquake.
Reckoning that a burglary is sufficiently unlikely Holmes goes back to work. (Leaving the noise for Watson)