Certainly an interesting subject and being based on science for my career and just in general, sometimes these kind of things are just super hard to explain...with that said, I had a weird experience happen and it didn’t involve seeing or hearing anyone or anything but rather seeing something else...my Dad was killed in a motorcycle accident many years ago and several years later I noticed while showering that his name was written on the glass in the shower...it came out of nowhere and I thought well maybe one of the kids, who were young at the time, wrote it there...so,I finished up and squeegeed the glass doors to clean them off...one of my kids showered later that night and said daddy there’s a name written on the glass...who is it? So they knew his name but called him grandpa only by what they had heard as he had passed before they were born...sure enough the name was,back, written into the fog filled glass...just as I had seen it before...I was starting to get a little weirded out but squeegeed the door again and it was gone...the glass completely clean...I even cleaned it again with cleaner, etc. just trying to make sure I wasn’t crazy...sure enough it was gone and the glass was clear as could be...the next day it was back...now I was getting really freaked out and just went with it as I didn’t know what to do...this went on for just 2 days and then was completely gone and I haven’t seen it since...was it Dad saying Hi or checking on us, maybe...but the craziest thing of all was, this name, his name, that kept appearing written on the glass was in his handwriting as if he’d literally walked up and wrote it himself...