What fun little tricks or life hacks do you wish you learned sooner?

Is there any thing in life u wish u didn't find out about? Or anything that u wish u knew sooner? For an example, u know how with a bottle cap, u bring it up by your cheek, and flick it to make it fly across the room? Well, 1 day (im sitting passenger) going down the street windows down, music loud, chilling. I had change in my pocket that day, that when I sat inside the car, most my change falls out. So as I'm picking it up, I just put it on my lap instead of back in my pocket. But I have a penny in my hand. Holding it. For who knows why. I started thinking of I flick this out the window, as fast as we are going, against the wind, all this pops in my head. So, adjusting my grip I place the penny where is should be, and snap. OH SHIT WTF? I said out loud, my friend looks I ask him did u see that shit? I did it again to show him. So the penny coming out of my hand, coming out the window of the car, shoots out like a bullet. I knew it would've gained speed but no where even close to what it did, and smacks up against what ever it hits... fast forwarding, were driving next to a bunch of abandoned buildings. I see some with glass and wonder just how strong is it? So there go out my pennies... hitting walls, hitting air. But finally, SMACK, right on a window. Didn't happened right away, cuz I hit a few windows, and nothing happened. But there was 1 that hit that window and it looked like a shotgun was firing into it.
What fun little tricks or life hacks do you wish you learned sooner?
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