Whoa there, cowboy. You can put away your trigger finger for today. Come to think of it, while you're at it, why don't you let the gears between your ears cool down a bit? Pulsate by André Michelle is a relaxing little musical webtoy where you just click to create. Click anywhere within the black play area to create an orange circle that will expand until it touches another. When the two collide, they emit a tone and then shrink back down before expanding again. You can create as many circles as you want, including circles within circles, and the result is a simple but calming melody that sounds a bit like rain and a bit like a sedate toddler on a xylophone. Hit the [spacebar] to clear the screen.
It's lovely, it's relaxing, and it's just a shame that there's no way to share your musical explorations with people you can't physically pull into the room your computer is in. The ability to also just delete a single shape instead of the whole lot would have made it easier to experiment. Still, Pulsate is one of those simple little things that can put a smile on your face, and that's always a good thing. Despite a distinct lack of space aliens to blow up or princesses to rescue, it's a great way to spend some time. So go ahead and create a little; we promise you the universe will be safe for one afternoon without you.