Do you believe in Ghosts?

Last night Aaron came home and I was actually awake. He works nights and I'm usually asleep by the time he comes home....but I'm reading a good book right now, so I was awake, plus, the kids were tremendously hard to put to bed and I was pretty grumpy, but that's another story. So, he came home and told me some ghost stories.....which I did not appreciate. Have you met my husband, Aaron? He is about the least superstitious person I know...very grounded in the literal and doesn't let his imagination run away....unlike, me. About 2 weeks ago he was in his store, late, doing paperwork. He was alone when he suddenly saw a shadow run past him.....he went through the whole store he found nothing...he dismissed it. Then a few nights later...again in the store alone.....he was doing paperwork and suddenly something metal fell to floor....it freaked him right out and he went to investigate and again found nothing, he was completely alone. Then, two nights ago he was in the store alone....when he heard a box fall....he said his hairs (he doesn't have many...LOL) were standing on end and he had his phone ready to call 911. He found the box in the middle of an aisle...just sitting there on the floor. He decided it was high time for him to get out of there...he went to the safe to put the deposit in there....and.....he suddenly smelled a very nice perfumey smell, it was very strong. He was thoroughly freaked out.....he now believes there is a ghost haunting his store........what do you think?