The picking up on others' feelings? There are times when I feel sudden alarm, or other intense emotion, for no apparent reason. If I look around at who I am with I can generally see where it's coming from.
Am I actually "reading" their feelings? I don't know. Something in my makeup may be picking up subtle indications before either of us are even aware the emotion exists.
Over time I've learned to pay attention and it's a good skill to have.