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Hex his Quidditch robes so they look like Gryffindor ones to everyone but him.

Lock him in an empty classroom with every male from the Gryffindor Quidditch team.

Tell Voldemort he is giving information about Death Eaters to the Order of the Phoenix.

Tell Percy Weasely he made Penelope Clearwater lose her virginity.

Tell Harry Potter that he's the REAL reason Harry Nimbus 2000 got smashed.

Perform a Body-Bind curse on him just as he's about to get a goal during his next Quidditch game.

Inform Umbridge that he is half-troll.

On Valentines Day, owl him a note declaring your undying love but sign it, Marcus Flint and write that it's to Pansy.

"Intercept" said note and show it to Draco Malfoy.

Tell the Weasely twins that he kissed Angelina Johnson and Alicia Spinnet.

Impierus him and have him kiss Ginny Weasely in front of Harry Potter.

Bribe Filch into making him do a detention involving unicorns.

Tell Hagrid that he would LOVE a chance to ride Buckbeak.

Slip him a love potion that makes him obsessed with Oliver Wood.

Tell him that if he can get past Fluffy he will find something which will ensure Slytherin will always win the Quidditch Cup.

Tie him to a tree and call for threstals.

Cover him with owl treats and lock him in the Owlrey.

Slip him and Katie Bell love potions to make them fall in love with each other in the Great Hall.

Lock him and every male Quidditch player at Hogwarts in the Room of Requirement.

Jinx his broom to do everything it can to buck him off in the most humiliating way possible.

Set a rouge Bludger on him.

Tell Dobby he is the one who came up with the idea of abusing house-elves.

Use a love potion t make Professor Snape fall in love with him.

Lock him out of the castle during a full moon with Remus Lupin and Fenrir Greyback on the grounds.

Hope you liked it! Up next is: How to Torment Voldemort