Murai stepped on a fermented soybean and got mad at Onizuka, as his face was zoomed in, you can see a mark in his forehead the word "kill" in kanji.
Somehow Eikichi was able to write Doraemon on his own forehead, with bowling balls glued to his fingers. He was even able to hold his cigarette like this.
(Kunio's mom left them at the bowling alley, to help a friend.)
Eikichi: (Moaning) Why do I need to bowl with you? With a kid with stinky feet.
Kunio: That's my line, you baboon. I'm gonna send you back to Africa!
(Hiroshi goes out to polish his Cresta)
Hiroshi: Let's make you nice and shiny, my Cresta! (Drops his bucket) She's gone, she's gone, she's gone! Oh, MY CRESTA!
Hiroshi: (Staring out the window) Finally, finally, my Cresta is back. It was worth begging. Technically I didn't destroy it, so it shouldn't have been an issue.
(Kunio is annoyed at Eikichi who is playing Kokkuri-san)
Kunio: Oh, it's so dumb. Stupid. You know Kokkuri-san is a self-hypnotic trick. I heard it on TV.
Eikichi: Kokkuri-san, who has the stinkiest feet in our class?
(Everyone starts laughing) See, it is Kunio! Kokkuri-san... is the rumor true that he has crotch rot? It says he does!
Kunio: (Vexed) Who says so? You bastard! I'll kill you!
(Eikichi is playing "Kokkuri-san" with some of his students)
Eikichi: It's Hitomi! Don't you really like Hitomi?!
Student: (blushing) No, that's not true.
Eikichi: Look, Hitomi is blushing too. Does this mean a bookworm couple is born?
Kokkuri-san - Movie/Game
Kokkuri is a Japanese movie about three girls who work at a late night radio show. They decided to summon "Kokkuri-san", a spirit who can answer any question as a pastime but apparently reveals dark secrets that will make these girls turn against each other. This is also the Japanese version of the Ouija board.