Financial 404s
The Financial Times' 404 page lists "economical satire" to justify the missing content.
Spotify prompting mixes
Occasionally, Spotify will show you your top genres, and prompt if you want a playlist mix created for you.
Dynamic event previews
When changing the default length of a calendar event, Amie shows a dynamic preview of that event using your current time.
Onboarding Aha! Moment
During onboarding, Arc will encourage you to toggle adverts on a webpage on and off, to demonstrate the difference in experience (and the value they're adding).
Social pressure (and proof)
Etsy will show a banner when there is limited stock of an item, but many people have it in their baskets.
Intelligent post tagging
When adding a daily journal, Joor will interpret your content and assign a title and emotion. This reduces decision fatigue by making your daily entries simpler.
Using onboarding as a nudge
Headspace nudges you into sharing your 30-day passes with a friend, at the same time as onboarding that component.