How did I not know this!?

Mindblown

// What is printed?
// 1) I am A
// 2) I am B
// 3) I am overriden B
// 4) None - Compiler error; Ambiguous call

static void Main(string[] args)
{
	var implement = new Implementation();
	var overloads = new A();
	overloads.Method(implement);
	Console.ReadKey();
}

private interface I1 { }
private interface I2 { }

private class Implementation : I1, I2 { }

private class A : B
{
	public void Method(I2 overload2)
	{
		Console.WriteLine("I am A");
	}

	public override void Method(I1 overload1)
	{
		Console.WriteLine("I am overriden B");
	}
}

private class B
{
	public virtual void Method(I1 overload1)
	{
		Console.WriteLine("I am B");
	}
}