In another brilliant moment in the much-loved Cape Feare episode we saw Sideshow Bob getting trampled by a parade of elephants when attempting to stalk Bart. Perhaps this will inspire him when choosing his method to kill Bart and we might see the spikey-haired Simpson meet his end under the feet of an elephant. To add a more personal touch to it Bob could use Barts former beloved pet elephant Stampy to carry out the murderous act. Given that Stampy already nearly killed Bart in Season 14s Large Marge episode (when he stuffed Bart into his mouth and Krusty forgot Stampys safe-word to make him release Bart) Bob probably wouldnt even have to train him too much to carry out the act. It's a plan that can't fail... unless someone nearby happens to yell "magumbo" that is.