It was a hex she put on us. I told Madam Pomfrey I thought I'd seen her do something to Luna, and she said I wasn't just imagining it. She had me pick up a quill off her desk and then a book, and she did some sort of spell to measure something, and said the hex makes everything heavier than it is, including us. Our own bodies, I mean. She couldn't tell what hex it was. Could've been a bunch of things, but she was really well cross about it.

You should go see her if you are having trouble with the stairs or carrying things. She made it sound dangerous.

Don't want you falling over dead, mate.