http://www.dailymail.co.uk/news/art...-used-thieves-remove-watch-victims-wrist.html Old news article but worth a read.
Search for Apollo Robbins and you'll find some fun videos of him picking pockets and taking watches off of people's wrists.
"Ninety-five per cent of people wear their watch on their left wrist," says Bonsall, "So I've learnt to do this only with my right-hand -if you wear your watch on the other arm, you're probably safe." Makes sense. Now you know!
Even monkeys wear their watch on the left hand...although they have to shave their wrist... I am an outlier though, wearing mine on the right...