WTF, dynamic?

gistfile1.cs

using System;

namespace ConsoleApplication15
{
	public class Args
	{}

	public class Class 
	{
		public void Execute(Args args)
		{
			Console.WriteLine(args);
		}
	}

	class Program
	{
		static void Main()
		{
			dynamic c = new Class();

			// doesn't work:
			// object args = new Args();

			// works:
			//dynamic args = new Args();

			// works
			var args = new Args();
			
			c.Execute(args);
		}
	}
}