A British porch is a musty, forbidding non-room in which to fling a sodden umbrella or a muddy pair of boots; a guard against the elements and strangers. By contrast the good ol' American front porch seems to stand for positivity and openness; a platform from which to welcome or wave farewell; a place where things of significance could happen.
My dad tells me that he took us to a pantomime when I was very, very small - panto being a sort of English phenomenon. There's traditionally a part of the show where they'll invite kids up on the stage to interact with the show. I was too young to remember this, but my dad says that I was running up onstage before they even asked us.