Use VIM to make text with random capitalized words readable

I get newsletters in my email from someone who likes to add emphasis by writing words in all-caps, and it drives me crazy. So, I finally worked out a way to make it more bearable - by pasting the text into VIM, and doing a search and replace to change capitalized words to _lowercase_. Here's the command:

:%s/u{2,}/_L&_/g

not perfect, but good enough