The thought I had was about how greatly changed the English language is, even since a century ago. I mean... hm... *gives an example*

When I tried to struggle my way through War of the Worlds when I was in junior high school, I came upon the perfect example phrase. I don't remember the words verbatim, but it went something like this...

"he came down the stairs, ejaculating"

... which in context meant 'hesitating'. I'm sure that most languages have experienced similar changes, especially over the course of two centuries.