I don't know if it would work on electric pumpkins, but spider plants can be killed through application of cat. Long after the destruction of that one, my other roommate brought home a separate spider plant for the sole purpose of entertaining/acting as a salad bar to her cats. Within two weeks, it was down to stubs. It might have been able to grow back, but the cats weren't giving it much of a chance. Eventually, it got thrown out to make way for cat grass.