Here's a story from one of my very first official ghost hunting outings. I was just out of college and had joined up with this paranormal group to go investigate a place called Raynham Hall in Oyster Bay NY.
One of the legends about the place,which traces back to the Revolutionary War days and a famous spy ring, is that the smell of apples and cinnamon randomly permeates the kitchen. Docents at the museum say that when you smell the applie pie baking, it's the ghost of an African American servant welcoming you to the house.
There are also other parts of the story including roaming cold spots, and the sighting of several of the Townsend Family members and Brisit soldiers. (I might put this in historic haunts at some point. It is a really awesome place.)
I was only a trainee then and a camera was the only piece of equipment I owned. We all had walkie talkies so we could split up and roam the house. Well most of the group had wandered upstairs to what had been Sally Townsend's room where she is said to appear or make the room ice cold. I wandered off alone downstairs into the hallway outside the kitchen.
And then it hit me, the sweet smee of baked apples and cinnamon. It was wafting all the way into the hall. We had only just heard the story about the woman who welcomes you by baking a ghostly pie and I was very eccited. But I didn't want to run in there camera flashing because it might startle her away before members with better equipment could get there to take readings.
So I got on the radio as quietly as I could (in the style of Peter Venkman from GhostBusters when he saw Slimer), and whispered "Hey...guys?"
"Yeah, what's up? We're in Sally's room.", said Peter, the leader of the group.
"You know the apple-cinnamon smell? It's here Pete. I smell it..."
Suddenly there was the soudn of a stampede of elephants as eight sets of feet came running from upstairs to the hallway outside the kitchen. We all went running into the kitchen, EMF meters beeping, cameras flashing, thermometers registering and recorders running.......
Only to find a giant bowl of cinnamon scented potpourri sitting on the counter!