KISS is so true, you never want to confuse the surfer
If you wanna take this a step further you can put a ".htaccess" file in your domains root folder with the following code(substitute
http://URL.URL for the location of the page)
Code:
ErrorDocument 404 http://URL.URL
Options All -indexes
that will send anyone snooping in your folders to SleazyBear's custom page

note: not everyone has the server authority required to use a htaccess file so you might have to ask your host