Ok so here is a possible situation..
BTC Is being pumped (parabolicly) buy big money investors until the launch of CME futures on the 17th Dec 2017.
This is when they will open a short position on BTC and dump their holdings. FUD will start to spread and panic will set in.
People will panic sell and the price will plummet to around 10k.
*Please note*
This is only a theory and is a high risk trade. If you are a long term holder it may be better to just hodl.
Good luck!
- phazednb