Neville : You know, if you're interested in plants, you should use Goshawk's Guide To Herbology. There's someone in Tibet who's growing gravity resistant trees...
Harry : Neville, no offense, but I really don't care about plants. Now, if there's a Tibetan turnip that will help me breathe underwater for an hour, great. But otherwise...
Neville : I don't know about turnips, but you could always use gillyweed.
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From: Harry Potter and the Goblet of Fire (2005)