I saw it with a YC theme, and the personal "it's been one of those days"* message.

* or similar

> Hacker News

> Yep, it's been one of those days... Hang on a bit while we make sure you're legit.

> Checking your browser before accessing ycombinator.com.

> This process is automatic. Your browser will redirect to your requested content shortly.

> Please allow up to 5 seconds…

LIES. It takes 5.85 seconds.

See https://www.cloudflare.com/ddos#layer7