This is an old favorite. Give each student a sheet of blank paper. Write the following words on the board in a vertical line: WHO, WHAT, HOW, WHERE, WHEN, WHY. Explain that everyone will be writing a sentence story. 

Write an example on the board, explain, asking for suggestions.
Tell them to write someone's name at the top of their paper, i.e., their own, a classmate's, the teacher's, a famous person that everyone knows; fold the paper over in half once so no one can see it, then pass the paper to the person on their right. Write on the received paper what the subject did (suggest funny or outrageous actions), fold it over and pass it on to the right. Continue to write one line, how they did it (adverbs), fold and pass; where-pass; when-pass; and last of all, why (because...) and pass it one more time. Have the students unfold their stories, and read them silently. Help anyone who cannot read what the others wrote, or doesn't understand. Ask one student at a time to read "their" story aloud, or turn the stories in for the teacher to read. Funny!