Gengai Hiraga quotes from Gintama (newest)

Kagura: Sounds like Rocky.
Gintoki: She's playing a Rocky-ish theme.
Kagura: It's similar, but...
Gintoki: It's the stuff adults worry about, you know, like getting into trouble if you use the real theme. But why Rocky?!
Gengai: Just hearing it motivates you.