The book of lost things. Why read it, you ask? It takes you on an adventure. It brings out your inner child. It makes you face your fears. It makes you laugh. It makes you cry. It makes you appreciate imagination in a whole new light.
Methought I heard a voice cry "Sleep no more! Macbeth does murder sleep," the innocent sleep, Sleep that knits up the ravell'd sleave of care, The death of each day's life, sore labour's bath, Balm of hurt minds, great nature's second course, Chief nourisher in life's feast— Act 2 scene 2
THIS. THIS is why I hate Snape so much. Everyone says he's such a tragic hero, but he's NOT. He's a bully, and instead of taking kids under his wing, because he KNOWS what it's like to be bullied, he bullies them more than anyone else. Snape is not a tragic hero. A tragic person, sure. But Snape was never a hero. And Remus Lupin was. Every day.
As a response to 7, 10 was holding it in so he could see all his companions again as himself and could do no longer when he reached the TARDIS. The build up of energy made it explode out of him whereas with 9 he just let it happen.