This one is funny, although not a big deal if you turn OFF settings accordingly but still a fun thing to surprise people.
http://news.cnet.com/8301-27080_3-2...-let-anyone-use-a-locked-iphone-4s/?tag=mncol
http://news.cnet.com/8301-27080_3-2...-let-anyone-use-a-locked-iphone-4s/?tag=mncol