One performer unveils something with a big flourish, and the other is amazed at how impressive it is.
Culture note The Big Light is Doraemon's gadget that makes things bigger. 腐女子 ("rotten girl") is slang for a woman who loves stories about romance between men.
The words appear when the audience laughs.
男同士じゃないか
Hold on, those are both guys!
Textbook男同士ではありませんか。「ではないか」 shortens to 「じゃないか」 (「では」→「じゃ」). Here it is a surprised exclamation, 'Why, it's two guys!', not a real negative.
A parent talks about how their daughter and a kid named Baba keep ending up in the same class.
The words appear when the audience laughs.
しかも、そのババって子とうちの子が学級委員の選挙で争ったそうじゃないですか。
And on top of that, I hear that Baba kid and my kid went head to head in the class rep election, you know?
Textbookしかも、その馬場さんという子とうちの子が学級委員の選挙で争ったそうですよね。Instead of '〜そうですよね', the speaker uses '〜そうじゃないですか', a rhetorical 'you know' presenting the fact as shared knowledge.