Leaky Acrobat Reader
Just needed to use a Windows XP machine, and I have to say, I was startled to find it still comes with some many background processes/applets/systemtray gubbins that eats up so many resources.
Then I noticed that if I clicked on a PDF AcroRead32.ext remained resident in memory using 32MB of RAM after I'd closed down all the applications.... is it any wonder GNU/Linux and Mac are becoming more and more common? ..
My prediction for 2017, a vastly commoditised software and OS market, with polished GNU/Linux distros up from the current 6% to a 30% market share.