500 on YouTube on non-existing videos

Now, this is embarassing... It looks like requesting a non-existent video on YouTube causes a "500 Internal Server Error"!

For example:

• Valid url: http://www.youtube.com/watch?v=b5CeNunbHto
• Invalid url: http://www.youtube.com/watch?v=wtf

Surely, a better response would be something like the one returned when the videoId is missing: http://www.youtube.com/watch?v=. It seems like predictions became true.