When you can't play the character you're known for anymore, what's next?
Vince Vaughn is at a crossroads, and beyond whatever value it has as a piece of entertainment, "Delivery Man" is a fascinating snapshot of a star in flux, struggling to maintain a comic persona that he's outgrown. It's a perfect collision of actor and material, but maybe not for the most apparent reason.
David Wozniak is a train crash of a person and, in fine Hollywood fashion, he's somehow managed to remain a complete train crash well into his 40s. That's mainly because he works for his father as part of the family business, a butcher's shop, and they seem willing to cut him a fair amount of slack.
At some point, you age out of playing these roles or the films start to feel somewhat pathetic, and I think Vince Vaughn has just reached that particular moment. If David is a 30 year old character, this is a turning point. If he's a 40 year old character, this is a last chance. Desperation changes as characters age, and so the stakes in "Delivery Man" are fairly high for David. He's got a regular girlfriend who he's ended up disappointing and hurting so many times that things are imploding as the film opens, and Emma (Cobie Smulders) is ready to move on. Or she is until she learns that she's pregnant, suddenly making things between her and David more urgent. He's either got to snap into focus as a person, or she has to move on and build a safe life for her child.