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Two factory workers are talking.
The woman says, "I can make the boss give me the day off."
The man replies, "And how would you do that?"
The woman says, "Just wait and see." She then hangs upside-down from the ceiling.
The boss comes in and says, "What are you doing?"
The woman replies, "I'm a light bulb."
The boss then says, "You've been working so much that you've gone crazy. I think you need to take the day off."
The man starts to follow her and the boss says, "Where are you going?"
The man says, "I'm going home, too. I can't work in the dark."
This joke came from Jokes for the ESL/EFL Classroom on The Internet TESL Journal's website (iteslj.org).
If you have some free time, try this SpeedWord Game on Opposites
If you like this kind of game, there are many more at Word Based Games for ESL Students.