Sun + Lens = Backyard Burn Zone
It's Saturday, it's sunny, let's see what a 2,000-degree solar ray can do. (Spoiler alert: you can melt pennies in your backyard using just a projection TV lens and a nearby star.)
Warning: do not try this at home, unless you're some dude on YouTube.
I'm frankly surprised Grant Thompson (or as I call him, Grantdor the Burninator) didn't burn his damn hands off trying this. Here's a bonus video in which Thompson starts a fire using three sheets of paper and a small bottle of water:
I think I've officially been blinded by science.