Not a joke, wasn't there a security expert who was also into S&M who was describing just how much plastic explosive could be smuggled in male and female body cavities?
This wasn't just some freak posting to forums, this was supposedly a government employee who was cited by the media.
That comment was made by the "expert" after the shoe bomber case broke. There are threads on FR that include the details but I don't know if it had it's own thread.