Flip it and watch the bubbles go up.

Why do they always put sand inside of hourglasses? Sand is pretty boring to watch. How about some bubbles in an hourglass? The Awaglass Hand-blown Timer Bubble Hourglass may not be as accurate as a sand hourglass, but it is a lot more fun to look at. It has a nice anti-gravity illusion created by the bubbles that are going up. Keep it on your desk at work and use it during the day when you need to relax. Like a stress ball but so much more interesting.

Buy on www.amazon.com
Under $25