Moral of the story: make sure you communicate your ideas thoroughly to Twilight, otherwise she'll get some…ahem…wild ideas.
On a related note, someone should probably stop her before she officially turns into a mad scientist. Before you know it, we'll have ponies glowing in the dark or rats that can spin webs (which, by the way, is something that they've kinda done with goats…basically some weird scientists out there have created spider goats).
And yeah, I intentionally left that chemistry joke in plain view. Thought it would make a good laugh, but I had to toy around a bit with the bubble placement.