At the very start of the movie adaptation of Prisoner of Azkaban, Harry attempts the spell Lumos Maxima in his bedroom. He then inflates his Aunt Marge and makes her float in the air.
How come he is doing this outside of Hogwarts as an underage wizard? The Trace is clearly still on him!
I understand the quote by the Minister for Magic, Cornelius Fudge, "Oh, come now, Harry. The Ministry does not send people to Azkaban for blowing up their aunts." But isn't that pretty much saying that casting any smaller spell is something that an underage wizard or witch can get away with?