Look at decompiled method System.Windows.Forms.Show(IWin32Window) in JustDecompile and look at it in ILSpy (http://ilspy.net/) or Reflector (http://www.reflector.net/). Though result in runtime is the same, decompilation in JustDecompile is strange and much less readable and understandable.

I think this kind of rather complex decompilation is also in other places.