I was home alone one day. I was not feeling well so I took the day off work. My boyfriend had already gone so that left me alone. I was watching TV when a loud humming started. Originally I thought this was the TV so I turned it off, but the humming continued. It was really starting to annoy me because it was making my headache worse. I put my ear defenders on and settled down to sleep on the sofa to make my headache better.
A few hours later I woke up and took my ear defenders off to hear someone rustling about in the kitchen. It sounded like someone was making dinner. Naturally I assumed it was my boyfriend and turned the TV on to let him know I was awake. When he didn't respond, I went out there to see if he was okay. There was no one there, but the frying pan was on the hob with some cut up bacon in it. I got really scared because I thought there was a robber in the house or someone else who had gotten in whilst I was asleep.
I checked all locks and doors to make sure no one had got in, then I searched everywhere for my boyfriend because he could have been pranking me. The house was empty. At that point I was so scared because no one could have gotten in so I was probably going crazy. I went back into the kitchen and found a bacon sandwich sitting on the side. A chill ran through my body.
I rushed to the lounge to get my phone and called my boyfriend, really begging in my head that he was in the house playing with me. He picked up so I knew he was at work. I told him about everything and he came home because I was that scared that I was crying on the phone to him.
Before he got home, I just stared at the sandwich to make sure it didn't go away leading my boyfriend to believe I was going crazy. The humming started again, but this time it was in some sort of rhythm. I listened intently to see if it was a song I knew or something else that was quite innocent. As I was doing this a door upstairs slammed and the dishwasher stared on it's own.
Thankfully my boyfriend came home at that exact point. He went upstairs and found no doors slammed and nothing out of place. He was very puzzled about the sandwich though. He had it for dinner, because I wouldn't touch it.
He doesn't believe in ghosts and I didn't either until a ghost made a bacon sandwich.
You mentioned also that up until this happened, you did not believe in ghosts. I would suggest that you don't have to come to a conclusion about this immediately. Don't look for more paranormal experiences, but be aware of your environment. Consider the suggestions made and try to come to a conclusion that makes you comfortable. You were the one who had the experience; you know what you saw and how you felt. These are just suggestions to help you process what you experienced. On the other hand, if you conclude that it was a paranormal event, it sounds benign.