If I was a student at Hogwarts I’d use Howlers to send nice messages to people.
So you’d be sitting there in the Great Hall eating breakfast when an owl drops a Howler in front of you. You, and everyone else on your table, just stares at it as it trembles, explodes open, shrieks I WANT TO TOUCH YOUR SWEET BUTT and then dissolves into flames.
A direct quote from The Times newspaper, talking about a Peter Ustinov documentary and saying that:
“highlights of his global tour include encounters with Nelson Mandela, an 800-year-old demigod and a dildo collector”.