Ghost or not

The winter's night, a man had lost his way in a forest. As he was walking about, a dwarf came up to him and asked, have you lost your way? - can help you get a room for the night and show you the way out of the forest in the morning." The man agreed because he was left with no other option.

It was very cold. The man's hand were getting numb and cold so he was raising his hands and blowing warm air from his mouth and rubbing his palm together. The dwarf just looked at him.

After sometime they reached the dwarfs house and soon the dwarf prepared some hot porridge for the man. Now he saw the man first raised a spoon full of the porridge, but before having it, he began blowing on it. The dwarf asked him, "Why are you blowing on the porridge?'

The man said, "It is hot so my breath will cool it down, then I can have it"

The dwarf got confused and thought he was a ghost and said, "Leave right now. -can't keep a man in my house who can blow hot and cold air with same breath." The man was shocked.

The others may not know what you know.