2.) Calling someone a retard playfully.
(retard) You tell that to Rain-Man, he almost bankrupted a casino and he was a ra-tard.
(guy 2) Its "retard", you retard.
-Not exactly the movie quote but it gets the job done.
2. (guy saying to some girl-friends (friends that are girls))
I hate you guys.
(girls start to pout)
Girls stop being such ra-tards, you know I love you! :) (smile)