[peterwwillis]

Same. Don't know Ruby at all, but in this case the language is pretty straightforward. Perhaps Ruby was the wrong example. Let's get more magical with Perl:

  map s {(\w+)} {\u$1}g, @sentence;

I'll give a dollar to anyone who already knows Perl and can tell me what the fuck is going on there.

[chromatic]

In rough English, it uppercases the first letter every word in every element of the sentence array.