I dunno, isn't it a little obtrusive? Automatic page sounds are rude manners.
I guess Lainchan has a pretty okay 404, but its song is a less obtrusive 8-bit cover. Blasting Hi-NRG that doesn't really begin until 40 seconds in is a little too much.
Either way, it would need a cool gif to be acceptable. I nominate this surprisingly well-synced Azumanga OP gif.