Many eager people just waiting for the moment the perceived top arrives and will cash out as fast as possible to secure these massive profits. The quick jump (and cash out) at 19,000 hints at the future. Once profit taking begins to happen, bitcoin may fall like a rock as late-joining traders panic and try to follow the trend.

It's like watching two trains approaching each other and you know they're going to collide but they're still a few hundred yards away...