I love throwing screw balls in the middle of workouts. Here is a quick drill I threw in to make each player accountable for their job.
It is the center's job the deliver a clean snap to the qb. The qb's job is to handle the snap and get an accurate pass to the wide receiver. Finally the wide receiver must bring in the catch no matter what.
What we are simulating is the end of the half or game, and the 2 minute offense that must be executed. There may be chaos on the field, people may be out of position. Each individual must do their job. These fellas successfully drove down the field with seconds remaining, ending the drive with a quick goal line td reception to win the game.