Simple, describe those awkward or dumb moments you've had when picking up the phone or walking into a random person (or any other case).
Mine would probably be that time I was at the gym, and, out of nowhere, this lady (probably around her forties) working out next to me, starts talking to me about how much women suffer when they have their period. She just kept talking and talking until she really got on my last nerve and made act kind of like a douchebag with her.
NOTE: It doesn't need to be necessarily a conversation, it might be any kind of situation.
P.S. Sorry for so many / in the title, but I tried to keep it as short as possible.