Thanks for the comments everybody!
The scribbles are basically a guestbook with messages and quotes from friends. some are famous sayings, some seem to be inside jokes.
"fairness is humans inner quality - Aamos"
" Merry Christmas to Jami from Pulu & Reino"
"Even a madman will pass for a genius if they keep their mouth shut"
"oh my, Jami and Pete..."
This is reference to a children's song that became a huge hit in 1983, about two kids who have a crush on each other. The chorus goes:
Minttu and Ville,
the two of them,
went to play tag together,
they just take care of each other,
and remember nothing else
It is....gloriously 80s https://www.youtub...atch?v=JNClPpIEX3g
"The secret to a happy life is that you can turn the million bitter drops that life offers you into a sweet soda"
"For my own darling- Emilia"
"Everything that can be imagined is possible"
Some things are written in Swedish:
"what should we do?"
"How many times must i say it, you are ummmm.....nice"
There is also some nonsense that i have no clue about, like "kutu Kutu", and stuff written in cyrillic which i cant read because i newer took Russian in school...