Some other warm-up games. Again, Junior High Level
My kids love hangman, but after that stupid article in the paper, I've been asked to change it. I still play it, but make the person into a cockroach or alien. Or you could do the classic man slowly being eaten by a shark.
Hot seat: This can be done in teams or solo for the small classes. One or two people stand in the front facing their classmates. Write words or phrases on the board behind them. Classmates give hints or answer questions to help the people guess what is written. When the person gets it, they can sit down (if playing with two people at front, the loser has to stay standing up front until they guess one of the words/phrases in the next few turns).
Categories: Everyone stands up, you name a category (ex Fruit), people take turns saying different fruits. When someone can't think of another English fruit, they are out (sit down), and you change the catergory and start again.