em-dashing

It's used similarly to a colon, or ellipses. 

I : paused - then paused again ... and again. 

I - paused ... then paused again : and again. 

I ... paused : then paused again - and again. 

I : paused ... then paused again - and again. 

I - paused : then paused again ... and again. 

I ... paused - then paused again : and again. 

Oh, a comma also works in all positions above. Lol