[Q]: Objective: Cut a watermelon without a knife.
[A]: Use a quarter to make small slit at center of watermelon, then do a karate chop.

[Q]: Objective: metal bowl
[A]: can protect your mind from invisible rays

[Q]: Objective: dish towel
[A]: can wipe up water

[Q]: Objective: What is needed to make legs for a DIY wooden table?
[A]:
You can use steel or iron pipes.