Headspace will show how many users are currently meditating. This uses social proof as a slight pressure to start.
Whilst reviewing an order, Fiverr will remind you of how long it took and how much you've spent. It's subtle, but helps frame the value that you've received.
When selecting your reading speed, Speechify will frame it in terms of boosted productivity.
Waze will occasionally show 'special themed' prompts, which modify your avatar and voice settings. This helps keep the map diverse and visually interesting for everyone.
Speechify's (the text-to-voice app) onboarding process is all narrated, and they immediately cycle between recognisable voices.
Very rarely, if you drag a card from one column to another, Asana will show an animated Yeti hiding underneath it.