On the smartphone cover someone should sell

I was lying in the bath the other day when it struck me that Douglas Adams was vaguely prescient in having the fictional Hitchhiker's Guide to the Galaxy be largely written and edited by amateurs. Consider the fact that a recent study concluded that Wikipedia had about 4 errors per entry compared to 3 for the Encyclopedia Britannica. The former being "slightly cheaper". Furthermore, my iPhone was not unlike the electronic version of the Hitchhiker's Guide to the Galaxy, though in many ways, rather more powerful than the one Ford Prefect had.

This led me to the realization that what was needed was a smartphone cover that had the words "Don't panic" written on it in large, friendly letters. I'd buy one.