Of course the line gets deluded in the fact that he is a.) investigating and b.) things quickly go to shit for the poor guy.
Just about anytime Shadow beats Renoir up.
Casey is full of these. Especially since his personality seems to be a mix of his "bad boy" 2003 personality, and his totally nuts 80's personality. However readers shouldn't automatically expect a funny moment from him since this is a dark comic so even this version of Casey can be serious. Still he'll give you a good laugh every few pages he's in.