AMD or Intel, USB headphones or socket headphones, CH stick or Saitek, TrackIr or Hatswitch, Custom sounds or Game Sounds always give rise to very emotive responses
I have gained a lot of knowledge in regards to PC's reading these threads
I also have a IPhone which my wife gave me (it's a electronic do leash).
People get emotive about phones as well
My pet hate is moody PMs and butterbeans