Hammerman! Learning English Through Songs...and Hammers.

Learn a song.
Break it into parts (6~8 depending on the size of each group)
Students work as a team to memorize their part, and practice singing as a team. Give them time to work it out! 
They get three chances. A student from another team holds a squeaky hammer. If the singers fail, they all are hit on the back with the hammer. GENTLY.
If, however, they succeed on the first try, the "hammerman" gets hit on the back --GENTLY-- by EACH singer!

Activity causes a lot of laughing and hard working. fun game. takes a lot of time!

The Blindfold Game

Get students comfortable asking a question, "Is it a pencil?" 

One student is blindfolded. 

They are given an item, and the class asks "What's That?" 

Student gets three guesses. 

Is it a pencil? 

No it isn't! 

Is it a pen? 

Yes! It is! 

It is easy, simple, great filler game. Kids love it because it involves a blindfold and tricking their classmates. I had been handing out pencils, rulers... and the last student I gave him a chair. The thought it was hilarious. 

If you need to stretch it out, show the item to the students theatrically first: miming a "secret" sign for them so they know not to tell! 

What's This? an ESL guessing game

For this class, students are learning school items (a book, a pencil, a pen, an eraser).
Review and display your vocabulary words. 
Intro Key phrases: 
Is it a pen? a pencil...? etc...etc
               Yes, it is! 
               No it isn't. 
Hide the cards close to your chest. team by team, let them guess using KP 
Answer using KP.
The team that guesses correctly gets a point. 
Make things even more fun by having students come up in your place and do the answering.