What are some of the most impressive onboarding processes you've experienced?

I'm curious about onboarding flows that really stood out to you, whether for a digital product, app, or even a physical product. What made them memorable? Were they particularly intuitive, engaging, or innovative? I'm looking for examples that effectively introduced the product's key features, reduced friction for new users, or created a 'wow' moment. Your insights could help us all improve our own onboarding experiences!