This is from my fanfic, Pablo's Pooltime fun. I recommend that you read that one first, but it isn't necessary.
Pablo loved going to the aquarium. The super-poisonous lion fish were, of course, his favorite. But today was different. Since he didn't try to get bitten by it on purpose, his mommy let him get off of the leash she always kept him on when they were out in public. And then, when he didn't run away to the parking lot to jump on random cars until they break, she let him get a toy shark.
Pablo was obsessed with his toy shark. He named it Bitey McBitington the Third and took it everywhere. However, he forgot that he wasn't allowed to take toys to school. The last time he got in trouble, the principal said he would get expelled if he broke another rule. And he was only in his second week of pre-school.
So Pablo ran out of the classroom, abandoning his coloring book and cookies. "I… have… to… POOOOOOOO!" he yelled to the teacher as he ran into the hall.
Locking the bathroom door behind him, Pablo took Bitey McBitington the Third out of his pocket. "I'll never forget you," Pablo said, kissing the toy shark. Then, with a final goodbye, Pablo flushed it down the toilet.
Unfortunately for Pablo, the toy shark got stuck. It, along with all of the other toys kids flushed away, gushed back up. And then a pipe somehow exploded.
Needless to say, the principal, along with all of the teachers, came running. "Pablo!" they yelled. "What did you do this time?"
And that's how Pablo got expelled from pre-school.