If you are confused about what to do in any given situation, ask yourself what would jesus do, and then do the opposite of that.
I lol'd. sig'd
keep old parking tickets in your car, place them on windshield when you illegally park.
tricky stuck-on stains? goo gone. goo gone doesn't work? brakleen will.
shop rags cost less than expensive paper towels, and work WAY better.
need a TV/couch/bed/refrigerator? check the craigslist free section first. you might have to go get it, but there is always nice shit on there.
craigslist. craigslist is a life hack.
live in a dorm? tape a bowl over the smoke detector to avoid the $50 fine for setting it off, and just don't start any fires.
if you have a car that needs super fuel, avgas is usually cheaper than premium+lead additive+octane booster. any airport will sell it to you.
I've got more...will post later