private static void SingAbout(ISingAbout animal)
{
Console.WriteLine("Old MacDonald had a farm ee ay ee ay oh");
Console.WriteLine("And on his farm there was a " + animal.Name + " ee ay ee ay oh");
Console.WriteLine("With a " + animal.MakeSoundTwice() + " here and a " + animal.MakeSoundTwice() + " there");
Console.WriteLine("Here a " + animal.MakeSoundOnce() + ", there a " + animal.MakeSoundOnce() + " everywhere a " + animal.MakeSoundTwice());
Console.WriteLine("Old Macdonald had a farm, ee ay ee ay oh");
Console.WriteLine();
}
public static void SingAbout(this ISingAbout animal)
{
// Be nice
}
