I have never seen anything unusual, with the naked eye, that is. Out of curiosity I have snapped a few pictures with a phone camera and believe to have captured a couple of orb shots.
I began taking pictures after a few unusual events happened, nothing really spectacular.
First one happened when I first bought the house. I had just picked my children up from school and stopped by to pick up supper at local restaurant. We arrived home and we all sat down to eat. All of a sudden, I heard the sound of water gushing, thinking to myself, oh no, the sink has sprung a leak! Running to the kitchen, I notice the faucet was on full blast so I turned it off. The children and I were the only ones there around 4pm, eating supper.
This next experience was to do with an old mantle clock that I keep unwound and not working. One night while working, I called home to talk to my teenage son. He was up fixing something to eat, all of a sudden the clock chimed. I asked him what he did; at this point he was in full panic saying the other siblings are in their room asleep and he was no where near the clock and didn't touch it.
The next evening I was home and decided to walk around the house with my camera phone (yeah, I'm not exactly a pro-ghost-buster) and snapped some shots, several of the mantle clock. I set the phone to the 6 shot sequence. In 2 of those shots, there is a red orb/circle/aura around the clock. In another picture, not really hunting, I took a picture of my daughter and new puppy, and it looks like an orb in motion flashing past her face.