Gravity

I wonder why God created gravity if he didn't want me to spit in the air and try to catch it in my mouth?  Or why He created windows if he didn't want them licked?  Or how about door handles (not knobs, I haven't mastered them yet) if I wasn't supposed to use them to escape.  I think I'm the funniest thing in the world when I accomplish any or all of the above...my mom, not so much.