One of my co-workers brought in a kitty litter cake, and I’m stuffing my face as I type. It’s yummy. I don’t think I’ll eat the poo, though, she made them look just a little too realistic.
No point, really, except I have kitty litter cake and you don’t. 
Wow that sounds cool, have you already heard of “Dirt Cake” it’s cake served in a flower pot, it’s just crushed up Oreos and other ingredients often times served with Gunmmi Worms in the middle, it looks like real dirt but tastes great.
My granny used to make that all the time back when she could see to do it. Now she just tells everybody else “Hey, make a dirt cake and say I did it.”
Pretty good stuff.
I’ve heard of dirt cake but I’ve never eaten one. I’ve made spider cake, though. Bake the cake in two round metal mixing bowls, one smaller than the other; the small one is the spider’s head and the big one is the body. Slice the top off the body, hollow it out, and fill it with green Jell-o or gooshy green icing or anything you can think of that looks gross and tastes good. Reassemble the thing and frost it and decorate it to look like a spider, with black licorice legs. I took one of these to a Cub Scout function once. It’s so easy to impress 10 year old boys. I just wish I could figure out a way to pressurize the interior so when you stick a knife into the cake the green stuff gushes out, instead of just oozing.