Go do something spontaneous... RIGHT NOW!

It doesn't have to be anything huge, it doesn't have to be anything dangerous or extravagant or outrageous... Something simple... Bust into song in the middle of a super market... Start a line dance in the parking lot of a department store... Fart and giggle about it when you're sitting by yourself...
Sometimes it pays to go a little bit bigger too... Crash a party and make friends with whoever is there... Go somewhere you've never been... Make up a game and get some other people to play it with you...
Or go WAY big and update the passport and go off on a trip... Learn to fly... Streak naked across the White House lawn... 
Hey, you only live once...