Those DotA sounds you hear whenever you do something special in DotA (consecutive kills, first kill, etc.) can not be found in the Warcraft III game itself but are specially made for that custom Warcraft III map.
Aside from giving the player a sense of accomplishment , it also provides a little bit of encouragement. I have them all compiled in separate MP3 files so you can use them in your videos or play them endlessly in your music player. :)
Download DotA Sounds