A performer tells how a prank, pressing a button first, led to a falling-out.
The words appear when the audience laughs.
対マンを張るというところまで発展しちゃって
it ended up escalating to the point of them squaring off one-on-one,
Textbook一対一でけんかをするところまで発展してしまいました。「発展してしまいました」→「発展しちゃって」: 「てしま」 shrinks to 「ちゃ」. The stage line uses the linking te-form 「ちゃって」 (from 「ちゃう」) instead of the final 「ちゃった」, with the same 'ended up…, things got out of hand' feel.
One person is walking another through their idea of what works best, step by step.
Culture note Hara hachi-bu, eating until you are 80% full, is a common Japanese saying about eating in moderation.
The words appear when the audience laughs.
眠くなったら、寝ちゃって。
Once you're sleepy, just go ahead and fall asleep.
Textbook眠くなったら、寝てしまってください。「寝てしまって」 contracts to 「寝ちゃって」 (「てしま」→「ちゃ」), meaning 'just go ahead and'; the bare て-form works as a casual request, dropping 「ください」.
After someone was seen in an embarrassing moment, a friend apologizes, sympathizing with how mortifying being seen must be.
The words appear when the audience laughs.
コウノ君のこと好きってバレちゃった
It got out that I like Kouno.
Textbookコウノ君のことが好きだと、ばれてしまいました。'バレてしまった' becomes 'バレちゃった' ('てしま' fuses into 'ちゃ'), keeping the 'oops, it got out' regret. Casual 'って' replaces 'だと' (the 'が' is dropped too).