The main reason I love emacs is because sometimes, I will inadvertantly hit a strange key combination and -- something unexpected will happen! Today I learned through this method that M-c will capitalize a word. That's a feature I don't need often, but whenever I do -- emacs will be there!
Update: I learned this while preparing to work on creating slides from a paper. A few minutes later, as I was collecting all statements of each main idea from my tex file and assimilating them into one single, complete statement for each main idea, I was about to manually capitalize a word but I remembered in time: Meta-c!