My house might be haunted.?

Last night, i was walking into the dinning room and the bowl hanging on the hanger dropped. That was the only sign i've saw about this paranormal idea. Could it be spirts from a different demension trying to make contact with me. I washed that bowl 8 times today. I'm worried the spirtual world knocked it over because one of them died with that bowl.. Should i call some paranormal investigators?