Mine made me learn where all the wacky symbols used in programming languages are, like {. If there's a key on your keyboard that you didn't learn when you first learned to touch type, but you now use, a blank keyboard will force you to learn to type it without looking at your keyboard.
The showing off is probably more important though.
I have often benefited from recommendations for Things I Didn't Know I Wanted.
Given that Less Wrong is a community of unusually intelligent, critical, and self-improvement-focused people, I suspect we can generate a pretty helpful thread of product recommendations — perhaps even a monthly thread of product recommendations.
Rules: