Okay, y'all. In spite of what some people will say, your use of language will influence what people think of you, and how intelligent and/or competent they think you are.
My current number one: You don't LOOSE your license, you lose it. (If your license is loose, you need to capture it...)
Don't even get me started on loosing YOU'RE license...
What are other some other linguistic "nails on chalkboard" for folks?