I do tech support, and have fielded 3 calls so far from people who can't figure out why the siren and the bloopy music are playing.
They were sure it was my fault. It was Google's, and/or the users for making Google their home page or (even more confusingly) a "load in the background" second tab behind their home page.
Freaked more than a few people out.
Search pages should be quiet, as far as I'm concerned.
-Les