Meg used to do that alot...it drove me barmy!!
In the end I did what Brainless did, just ignored it until she realised I was not having any of it...shes better now, but still tries it on the odd occasion.
Also I found if i picked her lead up and put it on once she was outside the door she was much better, gets excited still and does a little run on the garden, but then comes to me for her lead to be put on. Obviously this won't work for all and you have to have good recall, but it works for Meg

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A dog is not intelligent. Never trust an animal that's surprised by its own farts.