Christie Dietz's son chains his lime green balance bike to the same lamppost every morning, and like most habits, it probably became a mindless act done on autopilot — until something about the lamppost changed. On the morning of Sept. 24, there was a sticker on the lamppost [1] at kid height with a photo of the boy's bike (and its adorable Lightning McQueen bell) chained to it. On top of the photo there was a big "P" for parking, and below it, the word "only," marking it as just his.

"My son has parked his bike by this lamppost just about every day for the last year," Christie wrote on Twitter. "This morning, this sticker had appeared. Absolutely made our day. People can be so brilliant. Thank you, whoever did it."

Although it's still a mystery who made the sticker and adhered it to the post (one person seems to have claimed ownership, but it's still unclear), tons of Twitter users have replied to the thread to say that the stranger's kindness has restored their faith in humanity. And it's a good reminder: sometimes all it takes is a simple act to brighten people's days.