My favourite bit:
Allen: Right right (Suddenly dropping all pretense of courage) Look, I'm going to level with you - I don't want to go! I'm too young!
Agathon: But this is your chance to die for truth!
Allen: Don't misunderstand me. I'm all for truth. On the other hand I have a lunch date in Sparta next week and I'd hate to miss it. It's my turn to buy. You know those Spartans, they fight so easily.
Simmias: Is our wisest philosopher a coward?
Allen: I'm not a coward, and I'm not a hero. I'm somewhere in the middle.
Simmias: A cringing vermin.
Allen: That's approximately the spot.
Agathon: But it was you who proved that death doesn't exist.
Allen: Hey, listen - I've proved a lot of things. That's how I pay my rent. Theories and little observations. A puckish remark now and then. Occasional maxims. It beats picking olives, but let's not get carried away.
Agathon: But you have proved many times that the soul is immortal.
Allen: And it is! On paper. See, that's the thing about philosophy - it's not all that functional once you get out of class.