One of the greater pleasures in life is watching a rabbit clean itself.
Rabbits are actually somewhat fastidious, somewhat like cats - and like to keep themselves just as clean. Given the opportunity, they will lick their paws and then scrub their faces or clean themselves by licking away at their fur.
As I write this, Ibun is next to me on the chair, three feet on the ground and one in the air as he vigorously works away at his right hind foot cleaning a bit, then looking at me, then cleaning a bit more. It is a genuine pleasure to watch him diligently work away at washing himself, listening to the sounds of his tongue and his teeth digging in as he makes his black and white fur presentable.
All of the pleasure and joy for the cost of a little food, some hay, and pellets to change the litter box. What could be an ultimately cheaper source of joy?