You are an expert on paranormal activity and have been hired to locate a spirit haunting an old resort hotel. Strong signs indicate that the spirit lies behind one of four doors. The inscriptions on each door read as follows:

Door A: It's behind B or C
Door B: Its behind A or D
Door C: It's in here
Door D: It's not in here

Your psychic powers have told you three of the inscriptions are false, and one is true. Behind which door will you find the spirit?

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?

If you say my name, I will no longer exist. What am I?

Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?

A prisoner is told: "If you tell a lie, we will hang you and if you tell the truth, we will shoot you." What did the prisoner say to save himself?

Look at this sequence from top to bottom. What is the next number in the sequence?
1
11
21
1211
111221
312211

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

I have some blue and red sock in my drawer. I have a total of 4 socks. I pick 2 socks and the chance that I get a pair of red socks is 1/2.

What is the chance of picking a pair of blue socks?

How much will a 38° angle measure when looked at under a microscope that magnifies ten times?

Can you decipher the below rebus?

PBLUESAISNUERSES