Had to port a python code some other guy wrote using opencv for some image processing stuff to Java. I thought "how tough can it be? Let's just try it out on python first just to verify the results", only to waste an entire fucking day trying to install opencv first and make it work and to add to it the crappy opencv documentation were no help. In the end I had to just give up on this shit and decide to just do the Java implementation which I later verified from the python guy's results.