Personal pet peeves #34: people who use the word "literally" for emphasis.
I tried to write about this a while ago, but couldn't think of an actual example. At a meeting last night, though, I was given one: discussing two different furnace models for a town building, someone said that the more expensive model was bigger "and literally beefier."
Literally beefier? Wow, a protein-packed furnace? Wouldn't that smell? Not to mention it wouldn't last very long.