Twitter can be a weird and wonderful place where we get to see interactions between two of our favorite people happen right before our eyes. That's what happened earlier today between "Fault in Our Stars" author John Green and greatest of the human beings, "Harry Potter" author J.K. Rowling.

Green was busy tweeting about a Cyber Monday sale over at the DFTBA website when he realized that his new follower, Rowling -- also, #humblebrag -- would be seeing the tweets.

Then Rowling apparated out of the Twitter ether to share her own experience with themed-shirts.

You hear that?

That was the sound of your worlds colliding.