MonoImplicitBool.cs

public class SomeThang
{
	int whoCares;
	public SomeThang(int whatever)
	{
		whoCares = whatever;
	}
	
	static public implicit operator bool(SomeThang someThang)
	{
		return someThang != null;
	}
	
	public static void Main(string[] args)
	{
		SomeThang a = new SomeThang(69);
		SomeThang b = new SomeThang(1337);
		
		System.Console.WriteLine(a.GetHashCode() != b.GetHashCode()); // true
		System.Console.WriteLine(a != b); // true in .NET, false in Mono!
	}
}