He's not being sarcastic, really.
One of his most memorable traits is his sarcasm which pretty much annoys everyone around him. He uses his sarcasm to hide his true emotions for no reason except because he can. He can be serious at times and has a very bad temper when he is angered. He likes to collect all his problems until it burst even though his outbreaks tend to get the worst of him.
Two twin revolver at the size of his palms.
He grew up like every normal kid until his father died in an accident. His mother remarried and to be frank, Adam didn't like his new dad. He started turning to drugs and alcohol when one day, while under the influence, he was admitted into ER where he almost died. He survived and thought of it as a miracle and calling. He then left home and started wandering around and joined in any event if he 'felt like it'.