I worked for an online payment company you all know. Many eployees have access to the main DB which holds all transactions and names and everything in clear text. You could basically find out all PII (personal identification information) of any celebrity you wanted given they had anaccount. Address, phone number, credit card and all. If you knew a bit of SQL you could basically find whoever person you wanted and get purchase history and all.

Cant say I didnt use this to find stuff about my exes or various celebrities.