The Foot in the Door Technique

Luca: Can I have a whole pack of gum?

Me: No

Luca: Can I have a whole box of Tic Tacs?

Me: No

Luca: Can I have 4 pieces of gum?

Me: No

Luca: 4 Tic Tacs?

Me: No

Luca: Can I have one piece of gum and one Tic Tac?

Me: No

Luca: Can I have one Tic Tac if I promise not to tell Lincoln or Anna?

Me: Oh, alright!