using System;

public class Program

{

    public static void Main()

    {

        var harambe = WhatDoWeDo();

        harambe.SayHello();

        ((BaseHarambe)harambe).SayHello();

    }

    public static IHarambe WhatDoWeDo()

    {

        return new RealHarambe();   

    }

}

​

public interface IHarambe

{

    void SayHello();    

}

​

public abstract class BaseHarambe : IHarambe

{

    public virtual void SayHello()

    {

        Console.WriteLine("AAAEEEEEEEE");   

    }

}

​

public class RealHarambe : BaseHarambe

{

    public override void SayHello()

    {

        Console.WriteLine("DICKS OUT");

    }

}