A Hamburgler hit McDonald's asking "Where's the beef?!" and found it. Only this Hamburgler is clearly a data-tarian, he stole email addresses and birth dates of customers that signed up for deals and discounts. Thankfully, social security card numbers were not part of the breach. The data management is outsourced and no word yet on how this happened.
Keep in mind these breaches happen from time to time.
Walgreens recently had customer email addresses breached.
"Real Hamburglar Hacks McDonald's Database, Steals Tasty Info", Fox News - Reuters, December 14, 2010.