Years ago there was a bug zapper ad featuring Vincent Price. As the bugs were consumed he would chortle an evil laugh. Unfortunately I can't find it on Youtube. These innovative designs are part of an experiment in "predatory cyborg furniture". The only design that seems really gross is the coffee table that eats mice.
This is also got a mention on NPR, Meat-Eating Furniture, and slashdot, Designers Create Meat Eating Furniture.