person A: I was a bit shocked that someone was so nice this morning after being so rotten yesterday.
person B: Oh yeah? It's always a bit suspicious when someone just changes their attitude like that.
person A: yes especially after they did a lot to you and haven't even said sorry.  I can't deal with people with such huge mood swings.
person B: They didn't even apologize? Wow_comma_ that's rude. Well_comma_ hopefully their friendlier mood will last a while.
person A: I'm off that train so they aren't coming back on board until they get better.