[The Doctor is silent for a moment as he watches the other man. He turns to the Tardis' controls and rubs his hands together excitedly before he immediately starts fiddling with the various dials and knobs before throwing the switch. The Tardis takes off again, hurtling them through time and space but the Doctor hardly seems to notice as he speaks.]
Right then! New York 1939: across the pond trouble is mounting, Hitler has taken Poland while England and France are preparing for the inevitable war, President Roosevelt has called for neutrality as you lot are still reeling from the depression. In a few years something catastrophic will happen forcing your people to take up arms but, for now, New York is alive with hope.
[Once they've come to a complete stop he rushes towards the doors and throws them open] April of 1939 and the New York World's Fair! How about it, Vincent? around the universe and back again... shall we go?