I wouldn't call it a weird interface.

I would call it the one of the most confusing and idiotic interfaces I've used in a while. Or perhaps I'm stupid? That's how the website made me feel.

I had to delete the "Type a word here" placeholder text to get it to pick something for me (using Safari). I almost certainly would've given up and assumed it was a required input if you hadn't hinted that it can be made to work.