history: Once, I was walking home from work and it was late. My street was unusally quiet and there was a man walking quickly behind me. I was very scared. He ended up passing me but he whispered a nasty word as he walked past.  I was walking home from work late a few weeks ago and my street was unusually quiet.  What happened?
current: Well, there was a man walking really quickly behind me and there was no one around. 
next: Sounds a bit scary.  What did you do?