"Neville, ...I'm really, really sorry about this."
-- Hermione Granger, performing the Full Body Bind on Neville Longbottom (PS16)
When Neville catches the trio sneaking out of Gryffindor Tower after curfew (unbeknownst to him) to go protect the Sorcerer’s Stone he tries to stop them. He steps in front of the portrait hole and says he’ll fight them because he won’t let them get Gryffindor into any more trouble. Because they have no time to explain the details of their mission to Neville, Hermione puts the full body bind curse on him so they can leave the common room.