Attack on Titan.
I used to like watching lizards do pushups. I haven't taken the time to watch them do that lately, so maybe I'm not interested in it anymore.
The first very useful skill that comes to mind is literacy.
I had a teacher that said don't get married to a person until you start seeing and admitting there are things you don't like about the person you're dating. She said that once that happens, you can (hopefully) tell if you can live with that person.
One of the ones I have to deal with on a somewhat regular basis are sinks that don't have enough room for my hands. I like to be able to put my hand under the water without twisting my hand or it crashing into the porcelain.
Comfy, but since I shop online, I don't know entirely how comfy it is until it arrives.
A literal tar pit.
iTunes user agreements :P
Nope. But there are scholarships. Also there are lectures that are accessible for free on the internet (I've listened to some US Civil War era history from Yale recently). It's not good for networking. And it won't get you a fancy degree that looks good on a resume. But if you just want to learn while going for a jog or traveling to some destination, I recommend it. Keep aware enough of your surrounds to be safe though!
Depends on how long I need to stay awake. If I need to stay awake for multiple hours, then coffee. If not, then just try to put up with it and then sleep ASAP.