Capitalization of names that begin lowercased, at the beginning of a sentence
Let's say that you have a word that should be typed with leading lowercase letter. Perhaps it's a computer command. Perhaps it's an Internet nickname. I can't find any more serious examples.
When you put that word at the beginning of a sentence, should you capitalise it?
catallows you to display contents of a file.
The convention is that commands are typed in fixed-width font, so this doesn't stand out as much.
soccer_boy_89 turned out to be my sister's account.
This does, though.
Of course you could paraphrase the sentence such that the problematic word is not the first one, but that's not the point here.