Couple of things:
1) My dog used to stare at this corner of the house all the time. It's where we have a lot of old family photos. I should mention my dog was blind, so it was far more likely that she felt/heard something than saw anything. I don't like walking through there. I'll go the long way around.
2) My grandmother lived with us for a while about 10 years ago. She had a specific teacup she would use. One day, it completely disappeared. She searched for months and months for it to no avail. It was found outside a windowsill she could not possibly reach. She refused to use it and we threw it away.
3) My mom has been pushed while in the yard, and I too have felt something on my shoulder.
4) I had a ring which my dad gave to my mom in high school. I wore it to a cousin's house some 20 miles away and dropped it between the cracks of his new deck. He said he could rip up the wood and get it back, but I told him not to bother. Over a year later, it reappeared on my dresser, smack in the middle.
5) This is perhaps the scariest one. Everything else might have a plausible explanation, but I cannot explain this at all:
I was in our office on the computer playing a game one night. My mom was at the opposite end of the house watching TV. I could not hear the TV from the office. I had the game on very low. A woman's low voice spoke directly in my ear, as if someone had bent down to whisper to me. I thought it was my mom telling me something at first, so I had a delayed reaction. I asked my mom what she said only to turn around and not find her there.
I went over to where she was and she was seated watching TV. She hadn't called me, or raised the volume or anything. She then proceeded to sprinkle the house with holy water.
Oh, I've also had glimpses of shadow people disappearing into the walls, but I can totally accept that it was "the mind playing tricks." The audible clue was no trick. I wish I could make out what the voice was saying, but it was a mumbled whisper.
Edit: The house was built in 1996 and the previous owners weren't weird people.