You decided to trade-in your old car and go to the dealership. Somebody will ask for your car keys to take it for an evaluation ride, while the salesman shows you several other new cars for your trade-in consideration. You seem interested in a few, but are not sure yet what to do.
After a good 20 minutes, you might find it a bit weird that the “evaluator” is not back yet (or - although he came back with your car - he is now out for another ride, and forgot to return the keys). This is not an isolated case. Dealerships postpone the return of the keys on purpose, to let their salesmen convince the customers to buy from them, using all kinds of techniques.
How to avoid: go along for the evaluation ride.