Knowing someone has a bookmark, or even an item on the bookmarks bar, to a website, but insist on going to google and typing in the website name and then clicking on the entry in the google results. JUST SELECT THE FRICKING BOOKMARK!
People borrowing devices from my device drawer at work and not signing them out, and then getting upset when I get angry at them - even though I have a set of rules, which are agreed to before anyone borrows a device (bit more content, I'm senior QA for a software development team, we have a fair number of iPad and iPhone devices we need to test on, and developers need to develop code on, and over the years some devices have gone "missing" - so I implemented the system where you grab a device, sign it out in your name, use it, and sign in back in when you're done. If it's in your name and it goes "missing", it's your responsibility)
People "borrowing" 30 pin and lightning cables from my desk, sometimes actually unplugging them from the back of my machine! GET YOUR OWN CABLE! cheeky buggers. I have iOS written on the USB end of pretty much all cables and chargers we have so if I see it on someone's desk, I know they have "borrowed" it. Again people get upset when I ask why they stole a cable from my desk and clearly had no intention of bringing it back.
I'm with you on the talking during a movie / show thing, usually the morons on cell phones.
People who just stop in the middle of the sidewalk because they are doing something on their cell phone, usually texting. You'll be walking behind them, and then they just stop, completely oblivious to the world around them, and you nearly walk into them. Usually if you step around them they walk into you because they are still not looking where they are going.