Second year, this is the year for the twins. They spent all of their first year laying the groundwork for this and it's time to put it into play. This year the Weasley twins will become qaudtriplets. They have the four ties and they will use extremely ridiculous spells to try to give the illusion of their being four of them. Professors won't know what hit them. Fred dons a Slytherin the while George dons a Hufflepuff one. Lee then takes polyjuice position, brewed by Charlie, and takes the appearance of Fred before donning a Ravenclaw tie. They just have to hope Gryffindor doesn't notice the lack of them. They walk into the hall and sit at the tables, making sure to call attention to their existence.
After the feast Lee changes his tie to Gryffindor and they head up to their respective dorm. He has to fight the urge to cackle when Percy comes up to him and starts berating him for this stupid prank and why the he'll were you wearing a Hufflepuff tie at dinner. Throughout the speech about schoolwork and study he switches which table "fred" was sitting at. Good to know that even Percy can't tell them apart.