I had an unusual case of crabs. Most people get that from someone else who has it already.

Related:

• I stole this tagline from
  someone else...
• I'd started making up this revenge list, like people I'd like to get sooner or later.
  And the hang-up about doing this is that you're worried...
• I have a great diet. You're allowed to eat anything you want,
  but you must eat it with naked fat people. -- Ed...
• Jacques: First, you must get to know your lane. Feel the slickness,
  feel the slippery finish. Caresses it, experience it...
• Chandler: Well, y'know, I had some trouble with it at first too,
  but the way I look at it is, I get all the good stuff...
• In the handbook, it says that most people ignore the strange and unusual;
  while I myself *am*... strange and unusual. --...
• My girlfriend got crabs so I bought her fishnet
  stockings...
• Everybody has sex now. When I was a kid only women had sex and you had to get it from them.
  We got a battery-powered sexual aid. Actually, a flashlight...
• Ob- /ob/ pref. Obligatory. A piece of netiquette acknowledging that the author has been straying from the newsgroup's charter topic.
  For example, if a posting in alt.sex is a response...