This lesson is based on the "Password" game show.
The class is divided into two teams (middle school children tend to especially like it when boys have to play against girls). First, each team has to choose two players: a giver and a receiver. Then the game is played as follows:
The giver first thinks up some word, and then tries to make the receiver guess it by giving him/her one word clues.
Givers and receivers are changed if the giver is out of ideas as to how to make the receiver guess the word, and the receiver is changed after s/he had guessed two words wrong.
During the course of the game, children discover that words with opposite meanings (e.g. "Blue" for "Red") work good as clues only when said with a questioning intonation ("Stooooop?....." for "Go"),
and that it is very useful to know a lot of synonyms (words with similar meanings).
This game is so popular, we have to watch our noise level! (i.e. the players are having so much fun they laugh/shout a lot :) )