
Okay, it's just a NOTEBOOK.
What's the big deal?
The Big Bang Theory Season 10, Episode 20

Like all my underwear, that NOTEBOOK says,
"Property of Sheldon Cooper."
The Big Bang Theory Season 10, Episode 19

The NOTEBOOK isn't in the bathroom.
The Big Bang Theory Season 10, Episode 20

Where's my NOTEBOOK?
My NOTEBOOK's gone. Oh, no.
The Big Bang Theory Season 10, Episode 20

Nope. Pants in the microwave. No NOTEBOOK.
The Big Bang Theory Season 10, Episode 20