The best place to leave such a gift is in the kitchen or on Mommy's bed where she's not likely to miss it. Clean laundry, kitchen benches, and bathtubs make excellent sleeping quarters. LICK-IT DIET Let them open another can of food. Smear it around the dish then turn your nose up at it. When using the litter box, be sure to kick as much litter out of the box as possible.
Humans love the feel of kitty litter between their toes.
Also, refuse to use the litter box unless it's absolutely clean. When overweight, arrange yourself in attractive poses. They are small and camouflaged to be the same color as the bag, so they are hard to see. But you can easily hear the crinkling noises they make as they scurry around the bag. Anything, up to and including shredding the bag, can be done to kill them.