The Departed (2006). An undercover state cop who has infiltrated an Irish gang and a mole in the police force working for the same mob race to track down and identify each other before being exposed to the enemy, after both sides realize their outfit has a rat.
GUYS! This is the entire conversation between Thor and Loki in the cell scene!!! So sad.... I actually went "NO!!!!" at the end because it's so epic. Loki looks like he's gone mad... his eyes are hollow and he looks like he's seen a lot of suffering and just.... *starts crying* Okay I'll stop fangirling. Just watch it for me!!!