Putting punctuation marks in the quotes at the end of the sentence, when the punctuation is clearly in the scope of the sentence itself and not part of the quote.

Imagine if you wrote code like that:

string x = "Hi this is some text;"

string[] y = ["Never," "gonna," "give," "you," "up"];

And starting a sentence with “and”. You do it in speech all the time why not writing if you’re trying to sound “casual”?