When you let your rabbit eat part of your grape or a bite of banana, the moment you realize they eat their own poop on a daily basis.
The moment, you step on a poop and it sticks into the arch of your socked foot and you can't get it off without picking it off.
Or the moment, you open your fridge to find it dead. Only to check the cord and see that its been chewed through by your special little bunbun. Then they look at your with their little ears and noses and you want to kill them, but you give them a raisin instead because they're too cute.