Haiku focuses on a moment in time. Here are some ways to inspire yourself, below.
1) Pick a moment from one of your theater classes or performances. (Examples.: a warmup exercise, waiting back stage for your entrance, looking in the mirror while putting on your character's makeup, singing a song in the chorus, falling down by accident, bright lights in your eyes, etc)
2) Describe the moment in short lines. What do you see or hear? What thoughts go through your mind?
3) Change or delete words to make the required syllables (five, seven, five)
Read it out loud and enjoy remembering your moment in theater!