Mine sometimes do the SBD's and it sure does stink. Since I don't feed them wet food any more and try not to feed them people food they don't do it as often. The other night though one of them let one go and boy did it stink. All 3 of them just sat there and looked up at me like what's your problem. I think that the younger a cat is the more they will do this. My Cirrus is only 10 months old so it may be him that's doing this.