Oof.
Probably the worst thing that can happen in the digital world short of actual crime. It’s probably my biggest fear with a password manager, which leads me to keep monthly backups of my keepass database somewhere else. Thankfully, these are passwords I know by heart, so not really an issue.
What I usually do is write a passphrase down on the back of a business card (for whoever I recommend a password manager to) and make them use that to access their password manager. Usually, within a week they know this password by heart.