I like the ending. Through the whole poem you make the read think something sad has happened. I could almost swear someone was dead lol

I think this poem is, to say the least, trite. I'd say, work on your rhyme schemes. Don't use cheap tricks to rhyme like "they did sing" because people will know you couldn't think of anything better. And try to match rhythms and number of syllables per line, if you're going to write humorous poetry.
Love,
DueTuesday's friend Alyssa.

This is really good. I like the ending, it is kinda unexpected but once you read it, it makes perfect sense.

The ending's surprise was a nice one, it made me smile (happily!) and recollect some school memories.

That was cute! It reminds me of how quite the school is when everybody has gone home.

Nice job, Anna. A fairly surprising ending. I expected a tragic ending, say a school shooting, or the like. It's nice to see one or two poems around that have a happy note to them.