I want one of those too, and I had the same thought about it. I don't think it would be too spoilery, because unless you've seen the movie, or were already spoiled, you wouldn't know exactly what it meant. It's just a quote, like "let's be bad guys" or "she's a mite unpredictable" -- you don't know where it goes necessarily or what it means.

And those who know, well, they can understand why you have it.

I've given this a lot of thought, actually, because I want one.