QUOTE (HardworkingBoy @ Oct 22 2007, 11:46 PM)

yesterday i was at home reading a joke book and suddenly i feel angry to explode and i heard my parents yelling so i thought that maybe its empathy but then i had other times other people don't shout and i feel feelings suddenly so i thought it was luck so i thought i am crazy.
Younger people are able to "tune in" to emotional frequencies without them being aware sometimes. Just like how small kids will react to an environment with negative energy even if there is no outward manifestation of it among the people present. If you felt angry right before your parents began to yell, then this would be you picking up on that tension. If your home life is often volatile like this with negativity (my own was as a teen), then you will become sensitive to such vibes from other people. It is a self-defense mechanism.
At the same token, take care that you aren't repressing your own emotions. Sometimes emotional baggage can vent in strange ways and appear disconnected. For example, an incident may occur to which you seemingly have no reaction. Then days later you will get angry "out of blue" and seemingly for no reason when in fact that anger has roots in something that happened previously.
I would say your situation has a touch of both scenarios. No, you aren't crazy. But you should keep track of how often these things occur, what you are doing when they happen and what other people are doing around you also. Write it down then review it at a later date.