*based on a true story*

Co-worker: Let's release it
Me: Wait, I want to add just a little feature
Co-worker: Is it necessary?
Me: Trust me

*5 minutes later*

Co-worker: So, have you finished implementing your "little feature"?
Me: Yeah, well, it's done. Maybe.
Co-worker: What the hell have you done?
Me: MAYBE I've added 647 lines of codes to the file to implement my little feature, MAYBE it doesn't works and MAYBE the entire project is compromised
Co-worker: ah