Maybe you could get them to give you some vocabulary words or a story, and you could make it into some kind of rapping thing. (I have used a rap-style to show my students the rhythm of English--explaining of course that you don't speak like that when on the bus, etc., but you can really rap anything, including this.

) It's not necessary for them to know any--just to know the genre. At least it might perk them (and you!) up!
Well, here's an example of one I wrote (using the vowel sounds in cat and cot) This one is for two people/groups/etc.)
It's hot.
It's not.
It's not?
No, it's not.
Okay, it's not hot.
Tommy's fat.
He's not.
He's not?
No, he's not.
Okay, he's not fat.
Tammy's sad.
She's not.
She's not?
No, she's not.
Okay, she's not sad.
I'm mad.
You're not.
I'm not?
No, you're not.
Oh yes, I am. You're wrong. I'm mad!
You know, I was also thinking of different kinds of activities. Granted, I teach adults, but I think different types of matching card activities work also work well with younger kids. Sometimes I have conversations they have to put in order. (Each line of the conversation is on a different card, with the speaker's name on it.) I've also done scrambled sentences, where I've cut up a sentence and added two words as distractors, and put them in an envelope. Each pair of students has to make the sentence (not using 2 words). When the students finish one number, they put the words back in the envelope and get another one. If one group finishes fast, I check the work and tell them which ones they got wrong. Then we check them together. Sometimes their choices are also English, even though they aren't the same as mine.