If you're new to this delicious treat I recommend you read The Guardian's How to eat: a crisp sandwich. It's very important to use the right type of bread (mass-produced white sliced toastie loaf) and spread (salted butter), as well as the correct style and flavour of crisp.
A few friends are coming round this evening for a traditional Crisp Sandwich Supper and we'll all be wearing our Apparel of Laughs crisp sandwich t-shirts. The butties will be solemnly piped in, piled on a silver platter. We invited the face of Walkers Crisps, Gary Lineker, to recite the Address to a Crisp Sandwich, but sadly he wasn't available.
Address to a Crisp Sandwich
Praise be to you, my childhood treat,
The best of butties, hard to beat.
Today's your day, today we meet
To celebrate.