"Which is your favourite cheese in a cheeseburger?"
Imagine my surprise when she replied
"Well it used to be the blue cheese but I don't eat cheese any more because I'm a vegan."
"Oh yes, there are several vegans on the staff here - three in fact, plus one vegetarian."
"Anything to do with the food?"
"Oh no, I just couldn't help feeling sorry for them,"
The animals, I assumed she meant. But apparently management don't like them mentioning that bit.