This is Sam, he is very harmless but everyone finds him scary...
Okay this is a really bad drawing I will make a better one with a whole body... just showing how a werespider turns from human to spider.
They can't stay turned for very long or they start healing and can not, or have trouble changing back.
The fingernails actually grow really long and hard as well when they split in to the spider, and they don't "ungrow" afterwards they need to be trimmed off.
The last thing is they are super vulnerable when changing, as well the only way to know its a werespider when it looks like a human is to x-ray its body.
at 2:17 a.m.