Oh boy.
My step-sister, I haven't seen her in a year, had this old Windows 98 machine. Her dad installed Windows XP, and the old slug could hardly handle it. She was the kind of girl who would play with "Dress up barbie dolls", "Rockstar Fashion Show", "fre le online funne gaem". Yep. She'd download from pretty much any site she could find, and her system was flooded with hijackers, trojans and even win32.infostealer is what I think it's called.
When she was away with her mom, I installed Ubuntu 6.0 (because it was the only thing her machine could handle).
Later, when she came back, she saw her new computer in all of it's polished glory, and screamed at me for removing all of her "favorite games". I tried to explain to her that the machine could hardly handle all the software she put on it, and the fact that a majority of it was malicious. She started blaming her life's problems on me and called her dad while he was at work. As soon as he came back, he started yelling and told me I was grounded for a week. Too bad I had my computer in my room, step-dad. Later on that day, I was un-grounded and I smiled at my sister, an evil, sort of wicked smile. She really hated me then.
On related news, my mom and grandparents always blame me for the issues with their smartphones and tablets/computers. My grandmother blames me for her tablet being slow and shutting down, this really pisses me off. My grandfather gets extremely mad when his smartphone has issues, so I tend to avoid him then.