I remember there was a moment where Kohl tried saying "Oh, did I really say I'll swap all those nasty dull Ostmarks for lovely shiny Deutschmarks at 1:1? I meant to say 2:1, haha, D'OH!"
He had to back down pretty quickly, I think, but if he hadn't then perhaps that may have given the GDR impetus to say "Stuff your reuinification, we became economic top dogs in the WP without your help, so we'll just join the EEC in our own right and soon overtake you!"