During "Mission 2 - Diamond Dogs" on Mother Base, it is possible to shoot Ocelot with a tranquilizer gun. Doing so will make him say a few comments instead of knocking him out. Sometimes he will say "La Li Lu Le Lo", in reference to the Patriots from Metal Gear Solid 2: Sons of Liberty.
He will also sometimes say "Kawanishi-Noseguchi, Kinunobebashi, Takiyama, Uguisunomori, Tsuzumigataki", which is a shortened list of the names of train stations of the Myōken Line, operated by Nose Electric Railway in the Kansai region of Honshū, Japan. This is also a recurring easter egg that started in the first Metal Gear Solid.