Why would anyone want to make a car backfire?

It could be useful for demonstrations at renaissance Festivals, or reenactments. The article explains this clearly.

No, you don't. A backfire is caused by a rich fuel/air mixture, so some cars even backfire in low RPM.

If you have a turbo car, you install an anti-lag system or 2-step. But neither is healthy for your car and are quite expensive, since you need aftermarket electronic parts.

They are fun and entertaining, and they pass the time when you're bored. They also allow you to fidget with them instead of having to move your body or legs...

Not likely, but just as you can improvise a lighter, you can improvise gloves by wrapping any cloth around your hand a few times.

You can print NASA logos and other decorations to to glue on to the helmet. Look at images online of space helmets so you can get the details right, and...

After playing certain songs for long enough, people memorize the chord progressions for each song so they can just play off the top of their head.

Your car alarm may have a delay before it actually arms. It a safety feature to prevent tripping if one or more doors are not closed properly upon pressing the...

The light from an external flash can be really harsh. It can make it really hard to get natural-looking compositions, since you'll have these super dark shadows and bright highlights....