We had 2 girls as class pets in 8th grade. They were so cute and inquisitive! I started off just holding them, and really bonded with one of them, since she'd give me kisses and we'd cuddle (I love animals, but generally, they're not really interested in me. And when she returned my feelings it made my heart melt!) ...and I'd wanted rats ever since.
Unfortunately, the rats that were kept in our class were kept in an aquarium that was too small, with just an igloo, food dish and water bottle
... infact their cage wasn't cleaned frequently enough until I insisted on staying in and cleaning during lunch. They also lived off a seed mix, and were fed WAY too many yogurt drops a day (5 or more!!), since we didn't know better, and as kids, we had the mentality of "we should be allowed to eat all the candy we want! and the rats should too!"
Surprisingly, they both lived past 3 years, and didn't really have health problems. One of them did have some mild respiratory issues, but nowhere near as bad as what my current girls have... really sad, considering they live in a better environment and have a proper diet! lol... go figure!
My parents were extremely against it ( a VERY illogical argument of how wild rats would think that they're welcome to live at our place too if I owned pet rats, lol!!... in reality, my mother is just terrified of animals. She loves them, but she can't handle their close physical presence)
The first thing I did when I moved into a new house was get rats!
The parents weren't very happy about it... and still don't like them, but like to hear stories about their antics and have even offered to pay for vet bills if necessary.
I'm so glad I have this forum to refer too, or who knows what kind of inadequate care I'd be giving my rats? They wouldn't be living in a CN, that's for sure lol.