You can still have chemistry on screen without getting on with the person. But it just makes your job a lot easier if you don't have to gird your loins, if that's not quite the right phrase, every time you're going to do a scene with that person.
But, after all, we are a young nation, and vanity is a fault of youth.
I'm 16 now, I was 15 when it happened... and the encryption code wasn't in fact written by me, but written by the German member. There seems to be a bit of confusion about that part.

