How can I get Doc's notebook from Biff?

At the estate sale in Back to the Future episode 1: It's about time, I need to get Doc's notebook which contains details and designs for building a time machine back from Biff - it's stored in a model of the Hillsdale town hall which he has taken a liking to.

None of the conversation options work on him and he's being a jerk about it.

How can I get Doc's notebook from Biff?

Solution 1:

In order to get the guitar away from Biff, follow these steps;

• Use anything in the room, Biff will come and take it off you and your father will step in
• Talk to George (your father) and use the conversation option "I can fight my own battles..." - this will stop him from interfering when Biff takes things from you
• Use the amplifier controls on the huge amp/speaker
• Get your guitar out of the box next to George
• Use your guitar

Biff will come running along with the courthouse model under his arm, place it on the ground next to the amplifier, and then pinch your guitar off you and play a short riff on it, sending himself flying across the room into a shelving unit, which falls over on top of him;

Now you can help yourself to Doc's notebook.