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

Can you count the number of triangles in the given picture?

A man walked into a pub and went straight towards the Barman. He asked for a dirty martini from the Barman. The Barman thought something and then pulled out a pistol from his drawer and aimed it directly at the man. Why did he do that?

Can you count the number of seconds in a year?

Clue: You need to bother about calculation.

A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?

Only one color, but not one size,
Stuck at the bottom, yet easily flies.
Present in sun, but not in rain,
Doing no harm, and feeling no pain.
What is it?

They do not possess flesh or feathers or scales or bone
But still, they are blessed with fingers and thumbs of their own.

Can you decipher these quotes by Albert Einstein?
Blf xzm mvevi hloev z kilyovn lm gsv ovevo lm dsrxs rg dzh xivzgvw.

Move three sticks of the spiral below to form a square.

Make eight squares by moving only two matchsticks.
Note- Square can be of different sizes.