SIMBL.m

- (BOOL) killerMethod {
 return TRUE;
}

- (id) init {
 Class z = objc_getClass("Victim");
 Method orig = class_getInstanceMethod(z, @selector(victimMethod));
 Method repl = class_getInstanceMethod([self class], @selector(killerMethod));
 method_exchangeImplementations(orig, repl);
}