"Biff? It's Sarah," Sarah said over the phone.
"What do you want Sarah?" she heard Biff's reply. "We broke up last week, remember?"
"Oh yes of course. And why don't you remind me Biff," Sarah said calmly, "why did we break up?"
"I never did anything wrong," Biff snapped. "You're the cock-loving dyke who ruined it!"
"Ah so that's what you think of me," Sarah said calmly, although she was grinning from ear-to-ear. "And before we never speak to one another again, you're sure you're not going to apologise?"
"If I'd done anything wrong, I would! If I was caught chasing other bunnies, I think I would be decent enough to admit it!"
"Well then goodbye Biff, I'll not bother you again," Sarah grinned. That will do nicely, she thought.
"Good."