Ballentine, Scotch Whiskey distillers and CuteCircuit, London-based interactive clothing company have teamed up create world's first programmable, sharable and wearable t-shirt called: tshirtOS.

Not only is this futuristic, but also loads of fun. The t-shirt is like a canvas (LED screen) of your expression, using an iPhone app you can display tweets, images, music, status updates and even take photos.

"The story you tell is up to you" they say

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If you are reading this article, then there is definitely a geek somewhere in you.

Some of the T-Shirts in this list are incredibly witty. Some of then have great designs, while some are plain, simple and to the point.

I had so much fun while working on this list, I came across so many funny t-shirts, that I almost lost track of time. But I promised myself to find the 20 best, and with great difficulty and contemplation, I've handpicked some of the geekiest t-shirts available online. Have a look: