6. "Funny Little Human Brains. How Do You Get Around In Those Things?"
Seriously, how do you get around in those things!? It's terrifying to think that the size of the human brain has drastically decreased ever since evolution began. There's not enough room to go Superwholock on the world. Its dreadful. Come to think about it, that's probably why Donna couldn't continue travelling with the Doctor. If her brain was a wee bit larger, she could've at least managed to fit all of that knowledge in. On the other hand, that wouldve caused a huge rift in the show because she would then travel with him forever... and forever is a long time. To mull things a bit, there's nothing to be affected by personally because you're well aware that the Doctor likes to insult species when he's angry. Its justified to use this burn so long as you don't identify yourself as a human being.