"Mummy?" "Yes?" "Do spiders feel pain?" "Umm... I'm not sure really. I don't think they have a central nervous system, so they probably don't."
"What if mummy spider had an accident? Would daddy spider and baby spider be upset?"
"I dunno... spiders are quite simple. They don't do feelings as such." "So baby spider wouldn't be too bothered if daddy had an accident too?"
"It probably wouldn't spoil his day, if that's what you're thinking. I'm presuming baby is a 'he' of course." "Thanks, Mum."
"Why all the questions?" "Because I've just pulverised three spiders with your meat tenderising mallet."