Princess Leia: You're nothing but a no-good, stuck up, scruffy looking...
Nerf herder!
Han Solo: Who's scruffy looking?
Empire Strikes Back, in the medical bay of the rebel base on Hoth, shortly after Luke Skywalker is rescued, and shortly before the rockin' Battle of Hoth. God I'm a nerd
Thanks to asterphage for the correction on Leia's line