Do you remember those spelling and grammar tests you took in elementary school? They were for a purpose. I know, surprise, right? When do you use incorrect vs. incorrectly? What is the difference between "I could care less" and "I couldn't care less"? Ahh... haven't thought of that one before, have you? When will Mr. Webster accept "nucular" in the dictionary? It's close enough to nuclear, and everyone prounounces it like that anyway(s). Right? (Yes, it is "anyway" with no "s.") I think my favorite is "your" and "you're." FYI: "You're" is a contraction of "you are." If you tell someone they're great or they're coming to the movie, "You're great," "you're coming to the movie." (You are great, not your great... your great what? Your great aunt? Your is possessive. You are coming to the movie.) Clear as mud?
Watch this video to see how many "grammer" (actually spelled "grammar") mistakes you make.