We've all known that guy. The one wearing way too much cologne—fogging up the car or elevator with his pungent choice of fragrance. Or maybe you work next to a gent whose cologne just smells a bit off. It might not be his fault ... the poor bastard could've been duped by a salesperson. Or spritzing from a spoiled bottle. Here are a few common mistakes to avoid so you don't end up being that guy.