Wait, no! Don't break it! There will be plenty of opportunities to get yourself killed trying to get your cutie mark!
Oh, what a waste...
Heh! I can see a very good practical joke with this!
Say... Scootaloo were to purposefully dissapear for about a week. The CMC put that headstone somewhere in the cemetery, then they take Rainbow Dash to said cemetery saying there was something really important that she needed to see. Then they show her the headstone! I can just see her reaction:
Personally, I wanna see the CMC remain blank flanks for as long as possible because that's what makes those fillies entertaining. Their funny misadventures really adds to the show's flare! Take that away, and it won't be the same, IMO. :/