And then - Dilbert!
Dilbert discovers that the government is illegally copying all of his company's data. When the company computer system crashes, he restores it by hacking the government database. Government agents are dispatched to his mother's house, and this is what ensues:
Clearly, Mombert is an ISTJ. We may seem predictable, but we are also fiercely loyal. Start with our loved ones and the only thing you'll be able to predict is that it will end badly for you!
Thank you, Scott Adams, for finally and succinctly coming up with something ISTJ's can pin to show off our true colors in a positive light!