Horses

Aさん：「It was cool to go to the race track today.」
Zさん："Yeah, it was fun, even if I did lose some money on slow horses."
Aさん：「Yeah. Wanna grab dinner? Craving anything?」
Zさん："... 今日、蕎麦..."
Aさん：「... I assume you are just being clever and not trying to exact some weird culinary revenge...」  

ワイ

 Zさん："ワイ、Japanese people、ワイ...

... は sometimes pronounced as 'wa' ...
... of all the numbers between 1 and 10, only 4 and 7 have two pronunciations ...
... two words for cold, but only one for hot ...
... negative for some adjectives is 'kunai', but 'janai' for others

ワイ。。。" 

About Milk

Zさん："What is the name of the dairy farm's newsletter?"

Aさん：「I don't know, what?」

Zさん："The ギューニューズ"

完了

Zさん："You know, I think the kanji for 完了 is so named ironically. That second kanji does not look complete at all. It's like the creator gave up half way through."