Think about getting a kitten. Go to a garage sale and decide to get two. In a fit of compassion, decide to get Momma Cat, as well.
Wait, pleased, as she picks up weight and starts filling out, at least until you realize she’s preggers. Set up a nesting box and wait longer, as you have no idea who the baby daddy is and/or when the deed happened.
Eventually, you’re rewarded with kittens.