Which number should replace the question mark?

What is so fragile that saying its name breaks it?

John was so frustrated to be the suspect of being a sleeper terrorist that he shoot himself right between the eyes with a revolver in his toilet. The revolver and the bullets were accurate. Minutes later John walks out of the toilet unharmed.
How can this be possible?

How far can you walk into the woods?

Whats the next number in the below number sequence pattern.

When I get multiplied by any number, the sum of the figures in the product is always me. What am I?

John named his first son Alpha, second Beta, third Charlie and fourth Delta. What is the fifth son's name?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

John is on an island and there are three crates of fruit that have washed up in front of him. One crate contains only apples. One crate contains only oranges. The other crate contains both apples and oranges.

Each crate is labelled. One reads 'apples', one reads 'oranges', and one reads 'apples and oranges'. He know that NONE of the crates have been labeled correctly - they are all wrong.

If he can only take out and look at just one of the pieces of fruit from just one of the crates, how can he label all of the crates correctly?

Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?