HansK
Veteran
http://www.fool.com/News/mft/2004/mft04092011.htm
http://www.kryptonite.com/
Apparently, by stuffing a hollowed bic pen into the lock and twisting it's possible to open the lock. Not a joke, there's plenty of confirmed videos and even Kryptonite has confirmed it.
If you are locking anything of value with a Kryptonite lock or similar barrel based lock then you better find another lock. I've got four of their locks and will try having them replaced. Kryptonite at first was only planning to exchange newer locks that were registered and had proof of purchase. They are now offering a more extensive exchange.
Also, the ability to pick a barrel type lock isn't limited to those used by Krytonite. Others are also vunerable. For example, those nice little laptop keepers, etc..