What occurs twice in a week, once in a year but never in a day?

What number comes next in the series?

5 15 5 18 5 24 14 20 _

After a heavy Thanksgiving meal, the night watchman went to work. In the morning, he told his boss he had dreamed that a saboteur planted a bomb in the factory and that he felt it was a warning. The boss promptly fired him. Worker confused, Why boss fire him?

A man wants to cross the pit of fire which is 25 feet in length and he has 2 planks(fire resistant) 19 feet in length. How can he cross the pit of fire alive?

It has a long neck, A name of a bird, Feeds on cargo of ships, It's not alive,

What is 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?

What jumps when it walks and sits when it stands?

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

Get total of 120 by using five zeros 0,0,0,0,0 and any one mathematical operator.
Do you ?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?