Type 'zerg rush' into Google (or if you're lazy, click here) and you'll find yourself playing a new Starcraft inspired mini-game. Spam click the zerglings (Googlings?) before they eat your entire screen.
Tip: Like any good zerg rush, they'll be coming from below too!
Take note of your APM (actions per minute) displayed in the top-right corner. If you want to know how well you're doing, pro Starcraft II players average between 300-500 APM.