Do you actually fear them, because they are herbivores and will not eat you, they are also at the bottom of the food chain and so have no defences except hiding and running. It's normal not to want to touch them. :) just find out what your family is afraid of and do it to them, or just prank them normally, or **** up their lives,,,up to you. :) have fun
Nope. Well, tecnically you do racionally know that worms or slugs will do absolutely nothing to do, but it's perfectly normal to fear them.