This will crash kexmex!

gistfile1.txt

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    [self addObserver:self forKeyPath:@"DERP" options:NSKeyValueObservingOptionNew context:nil];
}


- (void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:animated];
    [self removeObserver:self forKeyPath:@"DERP"];
    [self removeObserver:self forKeyPath:@"DERP"];

}