The whole "bovine" joke was hilarious on one hand and a little horrifying on the other. It got me thinking: how would I feel if an animal I was about to consume came up to me enthusiastically conveying its consent for being eaten? I will be horrified, just like Arthur! But why?
Will it be better to eat against its consent instead? Why?
Then… what about salad's consent?! Interesting thought experiment…
I am presenting the joke in the form of three extracts from the text:
Extract 1:
"A large dairy animal approached Zaphod Beeblebrox's table, a large fat meaty quadruped of the bovine type with large watery eyes, small horns and what might almost have been an ingratiating smile on its lips. "Good evening," it lowed and sat back heavily on its haunches, "I am the main Dish of the Day. May I interest you in parts of my body?" It harrumphed and gurgled a bit, wriggled its hind quarters into a more comfortable position and gazed peacefully at them. Its gaze was met by looks of startled bewilderment from Arthur and Trillian, a resigned shrug from Ford Prefect and naked hunger from Zaphod Beeblebrox. "Something off the shoulder perhaps?" suggested the animal, "Braised in a white wine sauce?" "Er, your shoulder?" said Arthur in a horrified whisper. "
Extract 2:
"‘You mean this animal actually wants us to eat it?’ whispered Trillian to Ford. ‘Me?’ said Ford, with a glazed look in his eyes. ‘I don’t mean anything.’ ‘That’s absolutely horrible,’ exclaimed Arthur, ‘the most revolting thing I’ve ever heard.’ ‘What’s the problem, Earthman?’ said Zaphod, now transferring his attention to the animal’s enormous rump. ‘I just don’t want to eat an animal that’s standing there inviting me to,’ said Arthur, ‘it’s heartless.’ ‘Better than eating an animal that doesn’t want to be eaten,’ said Zaphod. ‘That’s not the point,’ Arthur protested. Then he thought about it for a moment. ‘All right,’ he said, ‘maybe it is the point. I don’t care, I’m not going to think about it now. I’ll just . . . er . . .’"
Extract 3:
"I think I’ll just have a green salad,’ he muttered. ‘May I urge you to consider my liver?’ asked the animal. ‘It must be very rich and tender by now, I’ve been force-feeding myself for months.’ ‘A green salad,’ said Arthur emphatically. ‘A green salad?’ said the animal, rolling his eyes disapprovingly at Arthur. ‘Are you going to tell me,’ said Arthur, ‘that I shouldn’t have green salad?’ ‘Well,’ said the animal, ‘I know many vegetables that are very clear on that point. Which is why it was eventually decided to cut through the whole tangled problem and breed an animal that actually wanted to be eaten and was capable of saying so clearly and distinctly. And here I am.’ It managed a very slight bow. ‘Glass of water, please,’ said Arthur."
Full disclosure, I am not a vegan.
However, I do know that not all plants we eat die as a result of being eaten, for example, eating apples from an apple tree does not kill anything - I suppose I can see that this is like eating eggs from a chicken.
Another example could be eating the leaves of rocket lettuce (but choosing not to uproot it), or the stalks of celery or rhubarb is another example, in both cases the plant can return to complete health over time.
Then there are some plants, such as grasses that require the ends of their blades to be eaten in order to be healthy.
Are you sure about the grasses and do you have some particular species in mind? As far as I know, they tolerate grazing, but it's preferable for them to not be parcially eaten. Apple, on the other hand, are so delicious because they're meant to be eaten (to spread the seads with the poop). Rocket lettuce definitely prefers not being eaten. The flavour we find nice was meant to deter us from eating the leaves.