My guess is at a certain point in popping corn in boiling oil, they throw watermelon juice on it (mostly water) and HOT grease and water mix in a violent way when combined with the natural gasses (O2, N, etc) causes - you know, just look up grease fires on youtube or your favorite alternative, like piped.

[–] topinambour_rex@lemmy.world 2 points 1 year ago

Add to this that water vapor has 100x less density than liquid water. With 1 liter of liquid water, you can produce 100l, or 1m³ of vapor water.

So very hot oil + water, makes big fireball.

[–] HeyThisIsntTheYMCA@lemmy.world 2 points 1 year ago (1 children)

There's a lot of sugar in watermelon juice. There was a dude in my dorms in undergrad who liked to take powdered sugar and make fireballs with it.

[–] Revan343@lemmy.ca 2 points 1 year ago

Powdered sugar burns so nicely because of the high surface area to volume ratio; watermelon burns like shit because it's mostly water