He said: "I hope it doesn't happen. I hope Ron gets killed off before they actually do something."
Unless you've been hiding under a box while the stars promote the film you'll know Rupert's favourite scene was the one with the slugs - , but he revealed he also wasn't keen on filming the bits with the spiders.
He said: "I hate them - even rubber ones I get scared of.
"Luckily some of them were CGI [computer graphics]. But that big car-sized one, that was actually there unfortunately."