A Lighter Bite!

A holiday maker goes into the wee shoppie at  Plockton  and ask's if they have anything to stop the "midges biting?  The shopkeeper slams down a pound of sugar on the counter and says "thats £1.50 please". The customer, a bit puzzled  ask's "what do I do with that? The reply being, put a bit of sugar on your collar!, The customer said "will that stop them biting", No said the shopkeeper, but it rots their teeth!!         Boom Boom!!!