1. The exam room romp

Leave it to Meredith and Derek to let out all their sexual frustrations in an exam room while the rest of the hospital was busy hosting a prom. Of course, things were much more complicated since Derek was still trying to work things out with his ex-wife, Addison, while Meredith was livid about being left out to dry. Alas, MerDer always found their way back to each other.