I mostly think about posting a clip of sound or song in chitchat section but it may also have another use, sometimes back I had a clip on speed of market to demo the 'pace' concept
http://www.elitetrader.com/vb/showthread.php?s=&postid=715106&highlight=pi%F1a+coladas#post715106 You can accomplish the same result by hosting the particular file offsite and linking to it. The code I used in the above link has autoplay turned on. - Spydertrader