Chuck is walking down the street and someone asks him to sign a petition to put clean-air legislation on the next ballot. He decides to sign the petition. Then the person asks whether he would like to give a donation to the associated environmental group. This technique is known as

The foot in the door phenomenon involves an easy request followed by a more difficult one. The bait and switch is a similar strategy, but involves taking away the initial request or offer, such as in (fake) limited Black Friday deals.