Exactly!! They could even have typed it up and distributed it to each other to read and re-read a couple of hundered times.
-------------------------------------------------------------------------------- for the kidnap theory fans - this guy Charles Croes said he was called because he ran a rental cell phone company on the island and the Twitty's know him (I think I got that right) and they wanted info "about a cell phone call" - since clearly Natalee's cell phone was not from one of this guy's phone (and the "chaperone" had Natalee's cell phone and was using it to call her family) what phone call could CC be refering to???
He was very carefully not saying more than "a phone call" and Greta was too - sounded as if they had an agreement that she would not ask about that phone call as part of the interview - or so it sounded to me.
so --- ransom call?