Recently when I was spending time with a friend, I noticed that I was happy and positive towards this friend until I got within arm's reach, and then I suddenly felt angry at this person. This happened several times. If I had no mental training, I might have started to make up thoughts to justify my anger. As it was, I had no inner triggers for the anger that I was aware of. What was going on?
I reckon that when someone is carrying an entity in their aura, other people might end up channelling the emotions of the entity, especially if they are within a short distance. I remember one friend of mine who had a domineering entity down the right side of the body. Was it a coincidence that we ended up being defensive with each other when I sat on that side of my friend's body?
I once heard a story about a rock in South America which made people feel jealousy when they stood near it. Not realising where the vibes were coming from, people would turn the feelings into something which made sense to them - they felt disadvantaged by their fellow travellers, or mistreated by their partner etc. Perhaps that rock is fiction, but it's an interesting concept. What if many of our emotions are just re-enactments of the emotions which hang in the air?