Back in my cabin crew days, we had one particular crew member (The type you would not like to have on board in an emergency situation!) who was known for her thick comments!
We were half way to TFS when she came rushing to the front galley, to inform us that the passenger in 26A was dead.
We, in a frenzy, got together some oxygen, defib etc and rushed down the cabin, only to be looking around for this 'dead' person. The passenger in 26A was sat up talking to her friend.
It turned out, that on the prior drinks service, she didn't respond to the crew member in question, and after the incident she said 'well, she looked dead'.
For this reason, we decided to play a joke on her. Downroute, we said that it was a new policy in TFS for a crew member to be on fire guard.
We had her stood at the bottom of the L1 steps holding a BCF and smoke hood box through the whole boarding process!