Scribbling the passwords in a notebook isn't a bad idea (although don't write "My Passwords" on the front cover). The security of physical things is well understood by most humans.
"Not Passwords" :D
How the hell do you remember randomly generated gibberish of a length that would be cryptographically secure?
Multi-word passphrases work great for me for everything that has to be kept in my mind safe. If I had to remember things like "LOZOktjR33IxVbACQsgicUtDubOyz9o2" I'd definitely have to drink less.