Enter Nina! Always one to make her Teutonic ancestors proud, Nina is always up to do stuff that would make most (read: normal) people squeamish. (Like, if you had to do home surgery on your cat or something, Nina's the girl you'd call). Anyway, Meredith told Nina about her cyst (which you can see in this photo if you look to the left of Nina's thumb) and before Meredith had even finished describing the procedure, Nina had a hardcover book out of her beach bag and was like "Let's do this."
It's hard to tell in this picture, but Meredith had recently developed a squishy, painful bump on her wrist that her doctor diagnosed as a ganglion cyst. He told her that she could have surgery to remove it, but warned that the cyst could reappear.
After doing some (dubious) online research, Meredith discovered that you can sometimes "treat" a cyst by whacking it really hard with a giant book or rock (!!!). This causes the cyst to "rupture and drain into the surrounding tissues." (I swear I'm not making this up!). Anyway, Meredith loves gross shit like that and tried for weeks to get me to take my giant dictionary and slam her wrist. That shit gives me the heebie jeebies so I was like "No way."