A good first impression can work wonders

Now, you two – this year, you behave yourselves. If I get one more owl telling me you've – you've blown up a toilet or –"
"Blown up a toilet? We've never blown up a toilet."
"Great idea though, thanks, Mum.

Not my daughter, you bitch!

You - will - never - touch - our - children - again!' screamed Mrs. Weasley.
Bellatrix laughed, the same exhilarated laugh her cousin Sirius had given as he toppled backwards through the veil, and suddenly Harry knew what was going to happen before it did.
Molly's curse soared beneath Bellatrix's outstretched arm and hit her squarely in the chest, directly over her heart.
Bellatrix's gloating smile froze, her eyes seemed to bulge: for the tiniest space of time she knew what had happened, and then she toppled, and the watching crowd roared, and Voldemort screamed.

I see a light in the kitchen. Let us not deprive Molly any longer of the chance to deplore how thin you are.

Oh, for heaven’s sake, Sirius, Dumbledore said no!”

A bearlike black dog had appeared at Harry’s side as Harry clambered over the various trunks cluttering the hall to get to Mrs. Weasley.

“Oh honestly,” said Mrs. Weasley despairingly. “Well, on your own head be it!”

The great black dog gave a joyful bark and gamboled around them, snapping at pigeons, and chasing its own tail. Harry couldn’t help laughing. Sirius had been trapped inside for a very long time.