Taken from 'English is not Normal' (Google it!)
"English started out as, essentially, a kind of German. Old English is so unlike the modern version that it feels like a stretch to think of them as the same language at all. Hwæt, we gardena in geardagum þeodcyninga þrym gefrunon – does that really mean 'So, we Spear-Danes have heard of the tribe-kings' glory in days of yore'? Icelanders can still read similar stories written in the Old Norse ancestor of their language 1,000 years ago, and yet, to the untrained eye, Beowulf might as well be in Turkish.
"The first thing that got us from there to here was the fact that, when the Angles, Saxons and Jutes (and also Frisians) brought their language to England, the island was already inhabited by people who spoke very different tongues."

And you object to Americanese? sheesh. Enough, already. :)