drive-by download
n.— «In some cases, people are not even asked whether they want the software. It just installs on the hard drive—a particularly troublesome tactic that some have dubbed “drive-by download.”» —“Web surfers brace for pop-up downloads” by Stefanie Olsen CNET News.com Apr. 8, 2002. (source: Double-Tongued Dictionary)
Further reading
You don’t really need those little rivets on your blue jeans. Those flat metal disks are leftovers from an earlier time, when jeans had to be much more durable. Such decorative elements that no longer serve a practical purpose are called skeuomorphs...
You pick up what you think a glass of water and take a sip, but it turns out to be Sprite. What’s the word for that sensation when you’re expecting one thing and taste something else? Also, slang from college campuses, like ratchet and dime piece...