Not a fan. Marcus Aurelius 1.5

From his adopted father, the emperor of Rome, Marcus Aurelius learned that you can participate in the games without being a fan. You can hear this passage <here>.

Παρὰ τοῦ τροφέως τὸ μήτε Πρασιανὸς μήτε Βενετιανὸς μήτε Παλμουλάριος ἢ Σκουτάριος γενέσθαι· καὶ τὸ φερέπονον καὶ ὀλιγοδεές· καὶ τὸ αὐτουργικὸν καὶ ἀπολύπραγμον· καὶ τὸ δυσπρόσδεκτον διαβολῆς.

From my foster-father (†) I learned not to be a fan: neither Green nor Blue, not a Thracian or a shield-man (‡). To endure much and need little. To fend for myself and avoid meddling with others. And to reject slander.

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(†) Titus Aelius Hadrianus Antoninus Augustus Pius (86-161 AD). Born into the Aurelii Fulvii, a Roman senatorial family raised to prominence when they sided with the Flavii in the wake of Nero's fall, Antoninus Pius was raised by his maternal grandfather, Gnaeus Arrius Antoninus. He had a distinguished but relatively uneventful political career, remaining in Italy his entire life, right up until the emperor Hadrian adopted him as heir, with the condition that he in turn adopt Marcus and his brother Lucius Verus (about whom more anon). 

(‡) Sports were serious business in Roman society. The Greens and Blues were rival chariot-racing factions, notorious for dangerous politicking (see Josephus, Antiquitates Judaicae 19.4.4 for one example). The Thracians and shield-men Marcus mentions were two different species of gladiator: the Thracians' equipment included a small buckler, the parmula, while shield-men carried a gigantic Roman scutum. The resulting disparity gave the Thracians more mobility, but less protection.