In case you were too lazy or disinterested to click on the Shitty Tipper Database at bitterwaitress.com yesterday, I’ll make it easy today by whetting your appetite. Serena and Venus Williams left a 7% tip and a lot of resentment in a Boston restaurant; Jennifer Lopez left $2.16 on her $752.34 check in Vancouver, then did virtually the same in London. Read why waitresses everywhere call such rich celebs as Madonna, Britney, and Rosie “cheap fucks.”