Stalin and Hitler in a Viennese café

Until watching this interesting documentary about Hitler and Stalin I'd never thought about the fact that both monsters never met in person (at least officially). All the contacts and negotiations between the Nazi Germany and the USSR (yes, both governments were "good friends" until Hitler decided to invade the USSR in 1941) were done by other people, never by the Heads of State.
For example it was Molotov and Ribbentrop who signed the Non-aggression pact (including the division of Europe between both superpowers), it was German and Russian officials who gathered together between 1939 and 1941 to discuss how their respective occupations were going, it was Russian soldiers who handed out Jews to the German soldiers...

So, it's strange that they never met together, could it be that there were some hidden hatred between them (mainly from Hitler to Stalin, it was Hitler who broke the pact, he was obsessed with wiping out Stalingrad...)
Could it be that they ran one into another in Vienna in 1913? (hey, this is not my investigation, it's mentioned in the documentary and in Wikipedia):

In January 1913, Stalin was sent to Vienna by Lenin and spent six weeks there writing an article "Marxism and the National Question".

Hitler, after being rejected twice by the Academy of Fine Arts Vienna (1907 – 1908), tried to make a living as a painter, copying scenes from postcards and selling his paintings to merchants and tourists. He left for Munich in May 1913 when he received the final part of his father's estate.

So, I'll let my imagination fly for a while (it's something I'm rather good at). Can you imagine Stalin and Hitler each one sitting alone in a Viennese café in a cold winter afternoon, both staring at the same chick? and then it's the Russian who picks up the girl. Can you imagine Hitler's raving hatred when seeing an "Aryan fecundity goddess" choosing the (in his supremacist rotten mind) "Slavic subhuman" over him... And then, can you imagine 25 years later the fanatic German leader preparing his revenge against the Russian flirter?

And, what would have happened if these two shitheads had turned friends just by chance?
Maybe Hitler would have considered Slavic people as the "true Aryans" and changed all his Norse mythology for old Slavic cults? Would the Atlantic Europe had turned into the "living space" for "GerRussia"? Would I be writing this post in German or Russian?

OK, enough rambling for today...