Nothing really. It was when i was boxing and all the testosterone made me have mood swings and a bad temper i guess. In high school if i saw someone getting picked on i would snap, or if someone cut in front of me in the line at a supermarket things would escalate quickly. Just things like that.
They figured i might be bi-polar, so they put me on mood stabilizers and then tried a bunch of different anti-depressants. Once i quit training and lost most of the muscle mass the problems went away because my hormone levels went back to whatever was normal i guess. So i dropped the meds and focused on working rather than boxing.
I thought about getting back into it when i started training for BJJ but i like being nicer, and now that i'm over 18 i can't risk the litigation and criminal charges that could ensue if i lost my cool over something silly.
If i need to defend myself, i'll just shoot the person.