Post an Invisible (Empty) Scrap in orkut funny trick

Click in the text area where you write scrap.
Hold down "alt" key and press "0173" from your keyboard Num Pad.
Now release "alt" and hit post scrap button.
It will post an empty scrap.

OR

Use the following code:
[i], [u], [b], [i][u], [i][b], [u][i], [u][b], [u][i][b], [i][u][b], [i][u][b][i]

It will be hard to guess for receiver what is there in the message.