Other dev in my department thought it was okay to comment out the latest version of jquery lib that was used in the project and replace it with about 2 year old version to make his feature work. He did not informed anybody about this and today when build was tested, blame was on me because the feature i implemented does not work. I found issue was because of old jquery lib he put.

Funny thing is, his feature does not work with latest jquery version.

I guess it's gotta be either me or him.