Once, long ago, humans had to rub two sticks together in order to light a fire. Later, they invented lighters, and matches; but sometimes even these tools proved dangerous, burning fingers or setting blazes accidentally. Should fire be restricted to safe place, like the screen of your smartphone? The free virtual Zippo lighter app allows you to play with fire without the negative consequences, and is a marginally cooler thing to hold up at a concert than just a glowing phone screen. If you need a bigger blaze to keep you warm, you can also curl up with the Web-based iFireplace.
What's the most useless, crazy, I-wouldn't-buy-that-if-it-was-free app you've seen? Tell me about it in the comments.