history: I was shopping at the grocery store when I noticed my fly was undone.  Hey there_comma_ I had an embarrassing situation today.. Oh_comma_ I'm sorry to hear that! It can be tough when we feel that we have lost face in front of others.
current: I was at the grocery store when I noticed my fly was undone!
next: Well, let's pretend that no one noticed! Either that, if someone noticed, perhaps they smiled when they thought "Wow, I've had that happen before, too" 