Courage

Forget The Sorcer's Stone where Dumbledore gives Neville Longbottom points for standing up to his friends. Forget The Deathly Hallows where Neville chops off the snake's head. In the movie version of the Goblet of Fire, Neville steals something from Professor Snape. That takes courage. That's why he's in Gryffindor. Or was he smart enough to choose it?