Why do you find that most of the buildings are deprived of the 13th floor?

Which Burger Is Different in below image?

I organized a small get together at my home.
In the party , i have a barrel with some whiskey in it.

Suddenly Guest 1 say 'I bet this barrel of whiskey is more than half full'.
'No, it's less than half full' Guest 2 replied.

I don't have any measuring instrument and without removing whiskey from it , how can i determine which of the guest is right ?

Things are just as they seem, right? Well, check again.
Can you count the number of tigers in this picture ?

It is deaf, Dumb and Blind!!!

Still, always tells the truth. What is it?

How many sides does a circle have?

What is black when you buy it, red when you use it, and gray when you throw it away?

Four men were in a boat on the lake. The boat turns over, and all four men sink to the bottom of the lake, yet not a single man got wet! Why?

What is the next shape from answers A, B, C, and D figure?

John was writing his first book. After saving the document, he locked his laptop with a password and mentioned some phrases for the hint box.

A friend of his tried opening his laptop but found out that it was password protected. Following is the hint that appeared.
1 mobile 3 books 2 roars 1 night 4 balls 2 lighters 1 ghost 1 hat 3 watches.

Can you help him in cracking the password?