They talked about what their companies were working on and about Rocket architectures. It's hard to imagine that the pair had any idea that 15 years later, SpaceX would actually be developing a rocket to go to Mars and that Blue Origin was on verge of completing a heavy-lift orbital launch vehicle.

And there's no doubt that the pair had any idea of the extent of the rivalry between them would become.

It's a rivalry that spans many years and many occurrences, tracing back to the affair of poaching employees.

Between 2005 and 2008, Blue Origin lured away a number of employees from SpaceX.

I couldn't find a source with the exact number but it got to the point to where SpaceX designed a way to filter employee's emails for the word "Blue Origin" According to a lawsuit filed by SpaceX against a former employee, the company claims that Blue Origin would hire carefully targeted SpaceX employees in order to gain information on SpaceX design efforts.