I'm sure that's how it goes, right? Have you ever accepted an invitation to dinner with a "Sure! What can I bring?" while your mind is thinking, "Um...do you HAVE anything to bring?" I have...dozens of times and it generally all works out fine.
Here is the result of one of those moments... Pumpkin loaf, turned into Pumpkin Cake...with a little pizzazz on top. =)
What recipes have you re-invented?