Here, take this. It will calm you down while I fight this dragon.

I'll bet a toenail shield would be pretty cool.  Not like the homemade prototype one that I have in my lab but one that via voice command would construct a perfect orb of toenails in a shield.

I'm thinking it could block things.

Not heavy things like a bullet but maybe a fork or macaroni.  

But imagine if you're in a theater and some guy sits right next to you even though the whole theater is vacant.  You could whisper into your lapel (where the toenail transponder rests), "raise shields--full toenail power, activate."

Then BAM.

Protected from touching elbows on the arm-rest.

Which I sure do hate touching strange hairy arms.

Sure do hate that.