People write about what they know. One of the prime motivations of confessional poetry was that we theoretically know more about ourselves than about anything else.
When you ask a group of thirteen- and fourteen-year-olds to write poetry, there is one guarantee: the boys will write about video games. In one portfolio of ten poems, one young man wrote two poems about games (including a haiku about “Call of Duty 5”), two poems about sports (one about playing, the other about watching), and one about hunting.
I mentioned this to a colleague this afternoon. She thought for a moment, then made a suggestion: “Next year you could tell them that each poem had to be about a different topic.”
“Then they’d simply say, ‘Well, they’re two different games, so that’s technically two different topics.'”