I was to give the Office example too. Easter eggs should NOT be removed. It's a completely known fact now that every software has easter eggs, and there is no reason to remove that little fun from the coding work.

This said, I'm pretty sure easter eggs will never be removed and there won't be on option to turn them off. Laying these is part of the developer's job :) People complaining that it's unprofessional should be more professional themselves. It's the responsibility of someone who does an install for a client to remove easter eggs if they want to. Just like they will remove hello dolly, install needed stuff, etc.