When I'm stressed or upset.... I kick or punch things and/or start screaming
so If a horse is stressing me, I'll slap him and yell at him
and if my mums getting on my case I tend to break a bone punching/kicking a wall (really need to get out of this)
When I'm at work and a client is blaming me for something out of my control, I take a deep breath, count to 3, and explain very calmly what actually happened, then I let off steam by bitching about it to the guy I work with later on (he does the same to me)
And If I'm really upset, I just try to blank my mind out, and focus on my work and doing more work faster in less time.... It normally works