A rat. It states 3 things :
1. Individuality = Girls love this otherwise I've wasted my short span on Earth.
2. Originality = Alright so I repeated the 1st thing, who cares? Chicks dig original doofusi. (Doofuses would be incorrect grammar...

)
And 3. Stupidity = The fact that you gave her something she despises gives her the idea that you're just plain stupid. Girls often take advantage of stupid guys if you know what I mean

.
Now if you still think I'm a crazy hobo for saying those things then you're absolutely RIGHT...
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Go with something cute like a hamster...Cheap...