Haven't you wished flight crews knew how you were feeling, scrunched up in your economy class seat whilst sulkily gobbling up peanuts? (How else could you be feeling but upset and angry?) British Airways' new blanket -- which was handed out in flights from London to New York City in a test run -- features technology that measures how you're feeling, then displays it, via color, on the blanket. It uses fibre-optic LED technology and connection to a brainwave-measuring headband. It's blue when you're content, red when stressed out.
Incidentally, the New Directors' Showcase at Cannes 2014 also displayed viewers' feelings about the shorts they were watching. That was done via a wristband.