Irony

A man walks into a shop...
Customer: "Worcester sauce flavour crisps please"
Shopkeeper: "Sorry can't, it's off the shelves, cancer scare."
Customer: "Oh right, Chinese Chicken Wings?"
Shopkeeper: "Ah that's the same. Cancer scare"
Customer: "Hamburger Relish?"
Shopkeeper: "Cancer scare"
Customer: "Sausage and Mash?"
Shopkeeper: "Cancer scare"
Customer: "Cottage Pie?"
Shopkeeper: "Yes, ...no wait, Cancer scare."
Customer: "So they're all off the shelves because of a Cancer scare?"
Shopkeeper: "Yes"
Customer: (sigh) "Just give me 20 Benson & Hedges then..."
Shopkeeper: "Certainly. £4.50 please."