Cliffhanger (prompt 'edge')
.
"There," the Doctor said, pulling Jamie up from his dangling position. Dislodged rocks tumbled and bounced; it was a long drop. "That was a bit of a cliffhanger, wasn't it?"
"I'll say," Jamie panted, half-bent as he recovered, then looked quizzical. "What is that, anyway? A cliffhanger? You're makin' a joke, something to do with stories, isn't it?"
"It's when something exciting happens but you don't know how it will turn out. You have to wait to see."
"Well, then that fits you more than me! You're a regular walkin' cliffhanger all the time. Doctor, watch out!"
"Oh dear. Run!"