For me, it's this:
The smell of a just cracked book and the Starman soundtrack in my ears. HR Giger and Sigourney Weaver. Black as midnight hair. The month November and all its misty coldness. Fizzy worms, oh fizzy worms and lamb spiced with cumin!
Those are the things that make me give in, to a variety of things and in a number of different ways.
Now it's your turn. Tell me what makes you give in, and I'll put your name in a hat, shake you all about, and choose one of you at random to receive a copy of my orsum fabulous amazing book, The Things That Make Me Give In.
And if what makes you give in happens to be "being put in a hat, shaken all about, and then chosen at random", well...all the better, eh?