Several years ago I was in Waitrose intent upon the purchase of some sandwiches for our neighbour, and one of the staff brought out some more sandwiches from the back place.
She was a wench of perhaps 50 years, and I was fascinated to see her start putting tuna sandwiches out right under the "VEGETARIAN" sign.
"So how long has tuna been vegetarian then?", says I, cheerily.
She thought for a moment, looked at the sign, looked at me and said "Well I suppose it depends what they eat."
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I'm always amazed at the amount of people who think fish is vegetarian!