1. The controller offers an immediate take-off when she has only a small break in traffic to get you out, and needs you to move quickly, or not at all. If you can't do an immediate take-off because you need more time to get yourself organized before taking off, reply "Unable" and stay where you are. There is no penalty for refusing an immediate. If you do accept this clearance, do not taxi at excessive speeds or corner dangerously. Just taxi smoothly into place and keep going.