Vengeance is generally very personal. There’s the jilted lover who slashes an ex’s tires in the middle of the night; or the disgruntled employee who sneaks toilet water into his or her boss’ tea. That said, it doesn’t mean you couldn’t use a little help posting elephant droppings, or tricking an ex into thinking s/he has an STD. Lucky for those who don’t believe that “revenge is a dish best served cold,” it seems that it has never been easier, with the Internet offering a variety of services to exact some payback. “Alex,” the founder of www.crabrevenge.com, says he doesn’t have any morals or ethics and so doesn’t feel any twinge when sending off packages of pubic lice to customers.