Could it be Ghosts???

just wondering....I have been having some strange things happening at my house such as lights flickering in the hallway, the plug of my tub being in the drain and the water turned on without anyone doing it....I was in the kitchen doing dishes and my husband and daughter had been sleeping for a couple hours when I shut off the water in the kitchen I still heard water running so I went to the bathroom to find the rubber stopper in the drain and the water turned on...I got a little spooked. Then tonight laying in bed was about to go to sleep and as soon as I layed down the light in the hallway started flickering when i woke up my husband then it stopped?? my husband thinks I am crazy LOL but I am a firm believer in GOD and I dont know why this would be happening?