He will go into the kitchen, stand on top of the litterbox and meow at the top of his lungs. If I don't respond to his meowing in short order, he will start banging the litter scoop, which sits tightly in between the litterbox and the garbage can. We call this "ringing the dinner bell" for service. If I don't respond to his banging of the scoop, he'll swat the scoop onto the floor, causing me to go into the kitchen, pick it up, and throw him more kibble while I'm there.
He'll do this even when he has plenty of kibble in the bowl, so maybe it's not about kibble but about attention. I'm not sure. A few times he has called when he wants fresh water or the litterbox to be cleaned, but usually it's for kibble.
I'd like to get him to stop this practice, but I'm not sure how. I could move the scoop, but I'm not sure where I'd put it and frankly, if it weren't the scoop, he'd find another way of calling for service. Maybe I should just accept the call.