To wait for the other shoe to drop - to wait for the inevitable next step or the final conclusion. Example - "He just opened his mail and moaned. Now I am waiting for the other shoe to drop when he finds the subpoena"
To have skin in the game - to be at risk financially because you have invested in something that you want to happen. Example - "You take more ownership of something when you have some skin in the game"
A song and dance - a long or complicated statement or story, especially one that is not true. Example - "She gave me some song and dance about her kids always being sick and not being able to get to the meetings"