The World's Least-Popular Four-Digit PIN: 8068

Research suggests thieves can guess one in five PINs by trying just three combinations.

•  Three most popular combinations—"1234," "1111," and "0000"—account for close to 20 percent of all four-digit passwords
•  Also quite common are MM/DD combinations—those in which the first two digits are between "01" and "12" and the last two are between "01" and "31."
•  The 17th-most popular 10-digit password is "3141592654." (ha, so nerdy!!)

Read more at Slate. (Thanks, Tom)