I was goofing off with my girlfriend, and we basically decided to run down a sidewalk. Well, being that drunk people make all sidewalks in Bogota, it went from level to about 3 foot up, and I didn't see it. I fell face foward, but I broke my fall with my palms (no damage there as I was wearing a long jacket that covered my arms and hands) and rolled over on my side. No blood or bruises, but now right below my right pec is killing me. I can't tell if it is the muscle or the top of my ribs. I heard something pop when I rolled, but I don't know what it is. It isn't horrible, but mainly when I lift my arms or sit up in bed or in a chair.