I usually like to remember a face, but in your case i'll make an exception.
When someone is singing someone else's song, ask them "who sings that again" once they reply, you say "yeah let's keep it that way".
If you're having a conversation about someone who you don't particularly like, say "You know what's interesting about him/her?" once they say oh what? you say "Nothing".
When you come across someone really frustrating, dense and generally common, when they say something you should say "Yes, you must be so mysteriouse 'n' deep".