There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

There was a competition where the contestants had to hold something. At the end of the event, the winner was a person who had no hands or feet. What was it that the contestants had to hold?

John’s parents have three sons: Snap, Crackle, and what’s the name of the third son?

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

You can hear me, but you can't touch or see me.

What am I?

Spot the cat in the picture below

How many triangles are there in the picture below?

A tree doubled in height each year until it reached its maximum height over the course of ten years. How many years did it take for the tree to reach half its maximum height?

Yesterday I fell from 30 feet high ladder but I don't get hurt. Why?

John went to meet his friend Jacob, but when he was about to reach the main gate, John notices that Jacob had a mighty dog who was fastened to the tree. The chain is long enough that it allows the dog to reach the main gate.

How can the John reach the main gate?