In episode 21 of Black Lagoon The Second Barrage Gin enters the Russian restaurant and says: "Souga's Sukeroku has come to play. Now where can I find Ikyu the Bearded?"
Ever wonder where that line came from?
Now you can know:
Sukeroku Yukari no Edo Zakura (Sukeroku Flower of Edo) 助六由縁江戸桜