Matt's part time job should be to walk around hospitals keeping people in good spirits. Look at how good he is at it.
Originally, I was trying to touch upon the subject of Mello's indestructible hair. It's been said time and time again, but I'll yelp about it once more:
Face + helmet + 'splosion = third-degree burns
Hair + nothing + 'splosion = not even a singe
Is Death Note telling us that helmets are useless? Or is Mello's hair made of pure gold? Perhaps Mello's hair was god's ultimate creation and he thought it shouldn't go to waste...
Or maybe it was burnt and Mello started wearing a wig after that...