What are some interesting rental businesses to start?

I’m intrigued by the rental business. Someone I know used to rent expensive editing machines to movie studios (back when you couldn’t do that sort of thing on an off the shelf computer). What are some interesting things I might be able to rent people? I’m up for anything: entertainment/events, health-related, healthcare, home/garden, business, travel, security, transportation, fitness, craft, fantasy, cooking, anything else? Unusual (and not so unusual) ideas anyone?