Could be worse, I came across a client's site that nobody who worked on it still worked for them (or could even be reached?) where whenever it had a server error, instead of saying "500 error" or "404 error" or any of that, it loaded a page that played a clip from the music video for Zainichi Funks "Scary Bomb". (also known online as "what if James Brown was a Japanese midget") Their staff couldn't even figure out what was triggering it... I go to /var/log to start poking around and see a slew of 500 errors in the logs. Finally track down that ANY response other than 200 was set in the httpd.conf of all places was set to redirect to that video with a rewrite rule.
There's being funny, and then there's being intentionally obtuse in a way that screws over whatever poor sod is working on the site next. Dimes to dollars the joker who did it thought they were adding security to the process.
Of course, would have been a LOT easier if said client didn't treat their in-house developers like toilet paper; wipe and flush. ANOTHER reason I prefer to freelance.