Last night, I saw another campy gladiator movie. There was a real missed opportunity inasmuch as no character ever uttered the line "Sometimes, I really gladi-hate you." Last night, I had a dream, and in my dream I wrote a teen comedy set in a gladiatorial school. There was a surly North African gladiator one day away from freedom, a Spaniard with a murdered family, a one-handed Celt with something to prove, a female…