They may not look dangerous, but if angered [bowtruckles] will gouge out human eyes with their fingers, which, as you can see, are very sharp and not at all desirable near the eyeballs.
J. K. RowlingI've often met people who are terrified, you know, in a straight jacket of their own making because they'd rather do anything that fail. They don't want to try for fear of failing.
J. K. Rowling