I don't think that they remove annoying ads simply because they're annoying. I remember that irritating mosquito one staying for a long while, but maybe that was because no one reported it correctly. (see the "Reporting bad ads" stickey)
So, your options that are left are
A. Turn your sound off.
B. Refresh the page till it's gone.
C. Get firefox/noscript/adblock.
EDIT: I guess they do remove sound ads, according to the FAQ, but you haven't reported it correctly, go read the thread to find out how to report it correctly, and that will help them get rid of it.
Edited, May 6th 2008 11:39am by NixNot