class overriding GetHashCode to trick caller

    class Program
    {
        static void Main(string[] args)
        {
            HashCodeCheater cheater1 = new HashCodeCheater();
            HashCodeCheater cheater2 = cheater1;

            Console.WriteLine("using virtual GetHashCode 1: " + cheater1.GetHashCode());
            Console.WriteLine("using virtual GetHashCode 2: " + cheater2.GetHashCode());

            Console.WriteLine("using NON virtual GetHashCode 1: " + RuntimeHelpers.GetHashCode(cheater1));
            Console.WriteLine("using NON virtual GetHashCode 2: " + RuntimeHelpers.GetHashCode(cheater2));

            /*
             * Sample output:
             *
             * using virtual GetHashCode 1: 685172186
             * using virtual GetHashCode 2: 659850042
             * using NON virtual GetHashCode 1: 62476613
             * using NON virtual GetHashCode 2: 62476613
             */
        }
    }

    class HashCodeCheater
    {
        private static readonly Random r = new Random();

        public override int GetHashCode()
        {
            return r.Next();
        }
    }