Manager told me to implement an analytics backend for our website. I said it was a waste of time since we could just use Google Analytics and get better analytics than if I spent several months on the projects. Manager told me to do it anyway. End of discussion. I defied him and connected our website to Google Analytics instead. He admitted that Google Analytics worked perfectly and saved us tons of work. Then told me that if I ever did that shit again and disobeyed him I would get fired.