With ebooks it just doesn't work, with mobile devices I get distracted.
Do you read the book first start to finish, and then add it to your bathroom library after for this random reading, or do you go straight to random loo reads?
My family probably thinks I have a severe bowel problem because sometimes I hang out in there for like a half hour.
If I don't have a basic understanding of the topic I read the first few chapters sequentially before starting the random picking, though.
Seriously though, I hadn't thought about using that time (which most people are guaranteed to have every single day, several times a day) for learning new things. I think I may start using this method for exploring things that I'd "like to learn some day" but that aren't urgent/currently important for my job. This would be a way to at least make me get started learning something genuinely new!