I have a sentence (and other sentences like it) in which I'm not sure what punctuation to use.
Remind me—what's your name again?
Remind me: what's your name again?
Or is there something else that would work better in sentences like this?
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The colon is used to convey a proportional relationship between two parts of a sentence, eg 'Remind me of something. That something is your name.
The em dash is usually used to convey a break in thought, while connecting the utterances either side of that break.
I will use a simple comma, unless there's a big fat pregnant pause. It is sad to see not a single answer explore this option.
If there is a big fat pregnant pause, I will use an em dash ("—", not "--", it's the 21st century and proper dashes are supported everywhere).
I would not use a colon here. It can be justified, but wouldn't be my choice.