About the badges, and the 'plan' for what will happen in the thread Elf posted The badges
Fred knew Draco had a plan here. Between Beau and Pansy, Fred realised that Draco wanted to alter the badges to do something offensive to Harry.
Fred recruited some help from friends he trusted to come up with an alternate plan to support Harry.
The Plan
Fred & George have further Charmed the badges to do two additional things, which will start happening when Pansy casts a discreet charm at a time they deem 'appropriate'. It will affect *all* the badges schoolwide. (This will be clearly marked in the subject line of the post. Until then, they will say 'Potter Stinks".):
First, And this *only* works when it hears the words "Draco" or "Malfoy."
Someone is on the badges, mimicking Draco's voice, saying, "I love you, Potter" and then there's a sound of a peacock screeching in the background - every time Draco or Malfoy is said near a badge. (yes, this will work, because we're going off the idea of a Quick Quotes Quill and how it's sound activated)
Second, when the peacock screeches, the badge will flash briefly to the profile of a white ferret kneeling on its front legs with a sword sticking out its arse. On the sword is a red and gold tassel. - The twins will not take credit for this, they are going to act as though some Gryffindor did it.