We have 2 layers of testing environments and production.

I tested the changes on the 1st layer, bud since it was 5min to lunch i did not test on 2nd layer which is connected to the production DB. I pushed to production and caused 5+ websites to go full retard and went to lunch.

Came back to 19emails and 3+ skype msgs about "why the fck would you do that..."

Estimated damages nearly 20k EUR and i lost some permissions for two weeks, but my great boss helped me out and cheered me up by telling stories how he took down multiple servers too

plot twist: im the team leader of our office now :)