A joke that went wrong

When I was 13, I bought a gelatinous toy at school that I used to play jokes with. I used it everyday during the hole 7th grade. It was very funny, but at the same time annoying for my classmates. I thought it was funny, but my classmates found it annoying. I remember that it was a large sticky frog-shaped toy, and it had a line that connected it to my hand, so it would never slip from my fingers.
One day, I threw it into my teacher´s classbook, and I broke tore some of its sheets the pages. (It wasn´t on purpose, I just failed, the joke was for my classmate) Angrily, my professor yelled at me. As a result he called my parents, and they argued with me. As a result, my professor scolded me, and called my parents. They scolded me too. Finally, I was prohibited to play with banned from my toy anymore.

"It was very funny, but at the same time annoying for my classmates."

Nothing actually incorrect here, just seemed odd :)

"I broke some of its sheets"

When referring to sheets, or pages in this case you say tear, or tore, rather than break or broke.

Nothing really incorrect about "Sheets" in this case, but it is vague. Pages is best here.

"Angrily, my professor yelled at me. As a result he called my parents, and they argued with me."

I simply moved this one around a bit because your professor yelling at you would be a "result" of your prank, same as him calling your parents, and scolded is more commonly used in this situation than "Yelled" or "Argued".

Otherwise, good job.

Hope this helps.

P.S.

I don't know if yours looked different, but in my experience they're hand-shaped. I Loved those things too. :P