Used in context:
Person 1: "Hey, man. Did you see the last event?"
Person 2: "Ah yeh, it's pretty sweet. I like these card-turning events!"
Person 1: "Did you also buy a Notebook? They are pretty handy!"
Person 2: "What?!? No, of course not. I'm not a blatant idiot.
If you want to better remember where the items are, you'd better use a REAL Notebook. It is more effective than costing Diamonds just to buy a virtual notebook.