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Flashback - To when Hedwig was killed and Uncle Vernon started beating Harry, only hours after he arrived back from school.
Gray Rain of Depression - Maria knew there was something wrong with Harry, and it immediately starts raining very hard as soon as she leaves her house to go to him. And then he quickly dies, of course.
Hammerspace - Where Uncle Vernon seems to keep his shotgun, and padlocks.
Improbable Use of a Weapon - By the text itself, Uncle Vernon must have been holding Hedwig's cage with one of his hands after Harry gave it to him, and then pulled out the shotgun with the other and shot her inside the cage. The same cage he's still holding with his hand, while he is wielding a (presumably) heavy shotgun with the other. Somehow, he didn't blow his cage-holding hand off or miss and hit Harry. Oh, and he does all this in less than a second.
Just in Time - Subverted. May not have been if the (five!) Weasleys didn't just stand there crying in shock.
Kick Them While They Are Down - Uncle Vernon beats Harry for not responding to his calls, and orders him to respond when he speaks to him. When Harry does, he cuts him off in mid-sentence and kicks him again, and tells him that he didn't say that he could speak...even though he just told him to do so.
Too Dumb to Live - Harry doesn't even try to do anything about his (or his girlfriend's) abuse, even though (at least earlier on) he was free to go as he pleased and could have easily said something to someone. He ultimately dies.