[Niamh.]

I only rewatched it again recently, there's so many good ones but the bit that always makes me laugh is when Vincent bring Mia to the drug dealers house after she ODs and he's explaining how to give the adrenaline shot to Vincent and he says you have to do it hard enough to go through the breast plate and he does the motion to show him and Vincent says "I have to stab her 3 times?"

From about 1:02

Youtube video