Pyramid is an American game show based on guessing words. It is perfect for esl classroom as it uses mostly relative clauses and it is pure fun. Show students a part of an actual show (I used one from Friends https://www.youtube.com/watch?v=28LNdwfhW6I . It shows also how not to play), cut up the worksheet and start the game! More detailed lesson plan could be found in my blog http://nastyagenrix.blogspot.ru/2014/08/using-pyramid-game-to-practice-relative.html