Imagine having a late night out with your bunch of mates, only to drink way more than you should. Stumbling home, you fumble with your bunch of keys, looking for the right one to open up the door. After a while, your reduced motor skills managed to pick out the correct key, and as you enter your pad, you realize that there is this urgent need for light lest you stumble all over the place and smash up that expensive showcase decoration in your living room. Reaching for your lamp, you flick the switch only to be greeted by…a math question. Solving this math question will turn the lamp on, but do otherwise and your room will still be pitch black. Guess knocking back one pint too many ain’t such a great idea after all, eh?
Source: Yanko Design