I used to keep ratties!
My favorite boy-a Siamese-passed away from old age when I moved to Missouri. He was the sweetest rat ever, but he pooped like mad when you picked him up
I kept three of his daughters-a trio of matching Himalayans. The momma jumped ship (completely disappeared) when they where only two in a half weeks old. They passed at about two years old after a productive life and retirement. I'd have to say my favorite moment with them was when I actually watched and assisted them through their first litter at 12AM.
I also had kept a Hairless and a Dumbo at one point. The hairless killed (and ate) the dumbo rather randomly one day (food dish and water bottle was always kept full). The hairless was put to sleep after that, he was always a strange rat, rather unpleasant personality'd rat. I got him from a petshop because he just looked so sad.
I also kept a tailless rattie. She was a HUGE black satin female. She lost her tail, save half an inch, one day in the big cage. After about two weeks of being separated and running around with a bandage on her tail she was ready to join the herd again. Tissue has healed over, but there was a little nubble of bone sticking out of the end. The whole thing eventually healed over with scar tissue. She ran around for a good three months with her tail sticking straight up in the air like a radio antenna
She never had any problems with it after that, though she did earn the rather unfortunate name of 'Stumpy'. She had to be my favorite female after the Spooky, Casper, and Hallow (the three Himalayans). I got her when she was about two, and she passed at three.
She only had one litter of three babies, born on the wire and gone before I found them
Even though she ran with boys after that, she never did have another litter. But she was an awesome rattie nonetheless.
Stumpy was the last rattie I kept. I sold a massive herd (about 35-40 ratties) of females to another breeder after that. I do miss them dearly...especially when you came with a treat and went "Hello ratties!" and they all came racing to the stop floor of the cage and clung to the bars
But now I have....BUNNIES! XD