Caffe Nero clearly sells more crisps when they (almost) hit you in the face when buying a sandwich. Clipped onto the multideck chiller, these work a treat.
Pret do it slightly differently http://greatcafes.blogspot.com/2011/03/that-extra-sale-crisps.html
Pret do it slightly differently http://greatcafes.blogspot.com/2011/03/that-extra-sale-crisps.html