I read an ebook1, highlighted it2, decided that reading app is ephemeral, ordered a "like new" paperback3, and copied over my highlights4.
Maybe even more strange: the last page of the paperback had a URL to "register my book" – which I did, thus qualifying for a $4.99 ebook.
1. on a phone, tablet, and computer
3. from a third-party vendor through an online marketplace
4. with a yellow ink pen