Crazy Ivan
1. In the book and movie "The Hunt for Red October", a sharp turn made by a Russian submarine to look behind it with sonar.

2. By analogy, any quick, unexpected and radical change in direction, literally or metaphorically.
1. Dammit, she's pulling a Crazy Ivan!  All stop!

2. Dammit, they're out of tickets.  Crazy Ivan--let's go to the bar.