10 ways to annoy Ron Weasley
I found some of these on other fanfics so bear with!
"Weasley Is Our King"- the Slytherin version, of course, off key in the middle of the Great Hall.
Tell him that Hermione doesn't want Lavender's sloppy seconds.
Tell him Emerson's considering making a move on Hermione, then look sympathetic and explain that you understand why he's threatened, Emerson's so... so...*dreamy sigh*
Depending on how badly he takes it and how funny you think it is, repeat number 3 with Harry/Draco/Dean/Michael Corner/Lockhart/McLaggen/Crabbe/Goyle/Snape/Sirius /any random boy or girl from Hogwarts, every few hours.
Ask him if he's sad that he was the baby his parents wanted to be a girl...
Handwrite a smutty Dramione fanfiction from Hermione's point of view, and scatter various pages anywhere you think he'll stumble across them... Fred/Hermione/George could work just as well, as could Harry/Hermione. Or, even better, Harry/Hermione/Draco!
Give him a big, fluffy maroon spider and a special packet of all-corned-beef-flavour Bertie Bott's Every Flavour Beans for his birthday.
"You know, I never realized, but apparently it was Lavender who dumped him. He shouted out 'Draco' in the middle of sex..."
Send him a Howler ostensibly from his Auntie Muriel berating him for stealing her clothes and informing him he will pay for those high heels he stretched out with his enormous feet!
Slip some Veritaserum in his pumpkin juice and ask him, at the breakfast table, what he really thinks of Snape/Hermione/Lavender etc. Make sure everyone hears this. Use a Sonorous Charm if you have to.
I am only doing 10 each chapter!