The narrator of the video showcases and tests various "ninja gadgets" to see if they can break a watermelon. The gadgets include a phone arrow, a ninja ring, a wooden katana, a metal katana, spiked knuckles, a kicking pad, a punching board, a one-inch punch, a forehead punch, a circle game thing punch, a finger strengthener, a punching clicker, and a tactical spork.
The narrator also tests a grappling hook by attaching it to a roof and pulling it to see if it will hold. The video ends with the narrator on the roof, stating that the grappling hook would have held if they had pulled it, but they chose not to climb it for safety reasons.
Here are the key facts extracted from the text:
1. The video features a person testing various ninja gadgets on a watermelon.
2. The person attempts to hit the watermelon with a phone arrow, but misses.
3. The phone arrow has a rubber tip and comes with multiple arrows.
4. The person tests a ninja ring, which is used for training and practicing hand movements.
5. The ninja ring has equidistant circle spacing and is used to practice blocking and cutting.
6. The person tests a katana, a wooden sword, on the watermelon.
7. The katana is made of bamboo, which contains a molecule called rhizome that makes it strong.
8. The person tests a metal katana on the watermelon, which successfully cuts through it.
9. The person tests brass knuckles with spikes, which are not made of metal but rather plastic.
10. The person tests a device called the "one-inch punch", which is used to break boards with a single punch.
11. The person tests a finger strengthener, which is a device that looks like a necklace but is used to strengthen fingers.
12. The person tests a punching clicker, which makes a clicking noise when punched.
13. The person tests a tactical spork, which is a multi-tool that includes a knife and a light.
14. The person tests a grappling hook, which is used to climb and swing.
15. The person attempts to use two grappling hooks to climb, but is hesitant due to safety concerns.