I inspected a house today that had two switches per bedroom for the overhead lights. They both turned the lights on but they did operate like a three way switch (I do not know why they would have been three way wired seeing as the are right next to each other). If Both switches are in the on position the light is on, if one is in the off position and the other is in the on position the light stays on and visa-versa. The only way the light stays off is if they are both in the off position. It was just very strange as I have never run across this before. Normally when they have two switches side by side like that it means that they are pre-wired for ceiling fans. I just want to see if you guys would call this out for needing further evaluation?