Ludi Apollinares
From LSJ
Δεῖ τοὺς μὲν εἶναι δυστυχεῖς, τοὺς δ' εὐτυχεῖς → Aliis necesse est bene sit, aliis sit male → Die einen trifft das Unglück, andere das Glück
Wikipedia EN
The Ludi Apollinares were solemn games (ludi) held annually by the ancient Romans in honor of the god Apollo. The tradition goes that at the first celebration hereof, they were suddenly invaded by the enemy, and obliged to take to their arms. A cloud of darts and arrows fell upon their enemies, and the Romans soon returned victorious to their sports.