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I would say "Why do you stink of piss, Hitler?"
And then while he was trying to work out why I travelled thorough time to ask him that when he probably doesn't smell of piss, I would whip out my dong and piss all over his shoes and trousers.
Then I would travel back to my own time before he realised what just happened and everyone would laugh at the nob-jockey.
The resulting humiliation would ensure he was never popular enough to start World War 2 and therefore never bomb Britain's comfiest cities so they had to be rebuilt as concrete monstrosities after the war.