Plus, we’ve seen how PB, in the past, has made a mechanical arm for the Blue Lady in Finn’s “head”. adventuretime-pics-gifs-vids
(from Batman Eternal, issue #4)
If you read the comics then you would know that Finn didn’t have arm in the future. Also, they showed this in the Finn’s mind in the episode when the Lich first appeared.
IMAGINE WRITING A BOOK THAT GETS PUBLISHED
like hearing thaT THEY’RE GOING TO PUBLISH YOUR BOOK
and then the coVER ART
and having a physical copy of your oWN WRITING IN BOOK FORM IN YOUR HANDS
WOW I WANT TO WRITE A BOOK