Vacationer, Hostage, Sponge

I was in the first day of a training class yesterday morning, when the instructor said to the assembled class "people who come to these things are either Vacationers, Hostages, or Sponges".  I bust out laughing.   Unfortunately, I am in the front row (they're assigned seats)..  I began the class as a hostage, but I changing over towards being more of a sponge.