A non-zero-based array. Guess what base it uses-- it could be anything!

trololol.m

@interface AQNonZeroBasedArray : NSArray
@end

@implementation AQNonZeroBasedArray
{
    NSArray * _realArray;
    NSUInteger _base;
}

// initialize it using AQNonZeroBasedArray * array = @[obj1, obj2, obj3];
- (id) initWithObjects: (id __unsafe_unretained []) objects count: (NSUInteger) count
{
    self = [super init];
    if ( self == nil )
        return ( nil );
    _realArray = [[NSArray alloc] initWithObjects: objects count: count];
    _base = arc4random() % 100;    // yeah, I'm not TOTALLY evil...
    return ( self );
}

- (NSUInteger) count
{
    return ( [_realArray count] );
}

- (id) objectAtIndex: (NSUInteger) index
{
    index -= _base;
    if ( NSLocationInRange(index, NSMakeRange(0, [_realArray count])) == NO )
        [NSException raise: @"AQNonZeroBaseSurpriseException" format: @"HAHA LOLWUT!?"];
    return ( [_realArray objectAtIndex: index] );
}

@end