Thank god I checked HN. I was driving myself crazy last half hour debugging a change to S3 uploads that I JUST pushed to production. Reminds me of the time my dad had an electrician come to work on something minor in his house. Suddenly power went out to the whole house, electrician couldn't figure out why for hours. Finally they realized this was the big east coast blackout!
Precisely how I discovered it. Imgur down. Imgur is almost like a piece of critical Internet infrastructure. That + some other site misbehaving tipped me off that something very wrong is happening...