Tunak is a craze esp on youtube which has in excess of 350 videos on the same. I learnt about this mania via Vivek :

What is with the new craze about Tunak Tunak Tun?

First, you have to check out the Tunak Trailer.

Then, you should watch Tunak Tunak Brown.

But StarCraft Tunak-Tunak is not so good.

My favorite is Tunak Tunak Jesus. Get the link from here.