As soon as you listen to this song, you will find it extremely familiar and that's why it has been chosen as soundtrack for many important events, as suggested by Metrolyrics and Wikipedia. You can use "Best Day of My Life" for any class, no matter your students' level or age, because it can be easily fitted to your needs. In this case I'm putting forward a quick lesson plan on idiomatic expressions and phrasal verbs, too, but you could think of other possibilities, as well!
Grammar focus on: idioms & phrasal verbs
Activity: circle the right option
Lyrics taken from: http://www.azlyrics.com/lyrics/americanauthors/bestdayofmylife.html
Let's talk about: positive feelings and sensations. 1) Can you remember the best day of your life? 2)How would you imagine the best day of your life?