The game idea is pretty simple: I come up with a situation for someone to be in. The next person then thinks of the absolute worst thing the person could hear someone say, then suggests a new situation. Then we keep going through words and situations.
Example:
A: "Things you never want to hear while having sex."
B: "'I HAVE AIDS!'
Things you never want to hear while stuck in traffic."
etc. I'll start us off:
Things you never want to hear when being operated on.