I didn’t know what the phrase that appeared on the scoreboard meant. Here's the picture:
My sensei told me it refers to a Japanese comic named Kojima Yoshio. The phrase is sonna no kankei ne wo shite ne, which means "Let's do 'It's None of My Business'," one of Kojima-san's jokes. According to Kikuchi Sensei, the comedian tells stories about unfortunate things that happen to him and ends the stories by saying, "It's none of my business" and doing a fist-pumping, leg-kicking dance. Click here for a link, provided by Kikuchi Sensei, to a You Tube video of one of his little skits.
Pretty wacky, huh? I browsed through other videos of Kojima-san, and I think that Speedo is the only bit of clothing he ever wears. Our crazy Orix Buffaloes fan in Osaka did the same action as Kojima-san, but, thankfully, he did this while remaining clothed.
Anyway, back to my Japanese lesson. "Pachi Pachi Pachi" is really "Pachi Pachi Panchi" (I overlooked a character, gomennasai). Here’s a link to Shimaki Johji, a guy who has made a living in Japan by beating his chest.
Special thanks to Kikuchi Sensei for her corrections and insight into Japanese pop culture!