Ok for example, I start by saying,"Unfortunately there was a giant evil pillow on the the loose; then the next person would say...Fortunately I had a knife with me and stabbed a hole in it"
Ok lets start. Unfortunately I was being chased by an elephant...
Fortunately, the Doctor comes back to pick up the assistant and then gets rid of the cybermen before leaving, not to be seen for another 10,000 years until he comes back two days later.