What is this behavior called?

I got a Kindle for my birthday and showed it to my friend. She doesn't like to read, but she liked the Kindle, and the next time I saw her, she had a one, too - the fancier version, with the color touch screen and everything; she never uses it. The same thing happened when I got an iPod; I had one, so she had... show more I got a Kindle for my birthday and showed it to my friend. She doesn't like to read, but she liked the Kindle, and the next time I saw her, she had a one, too - the fancier version, with the color touch screen and everything; she never uses it. The same thing happened when I got an iPod; I had one, so she had to have one, too, and I've never known her to use it. I thought the word for it was "petty," but the definition doesn't seem to match up with my situation.
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