What does this rebus mean?

O
N
C
E
TIME

Can you find out the number that should replace the question mark with a valid reason?

A man was driving a black truck. His lights were not on. The moon was not out. A lady was crossing the street. How did the man see her?

There are people and strange monkeys on this island, and you can not tell who is who (Edit: until you understand what they said - see below). They speak either only the truth or only lies.
Who are the following two guys?
A: B is a lying monkey. I am human.
B: A is telling the truth.

In the given picture, in how many ways can you read the word "Tiger"?

John went to meet his friend Jacob, but when he was about to reach the main gate, John notices that Jacob had a mighty dog who was fastened to the tree. The chain is long enough that it allows the dog to reach the main gate.

How can the John reach the main gate?

How many minutes are there in Feb 2017?

Note: The shortest answer is the correct answer.

You walk into a room and see a bed. On the bed, there are two dogs, five cats, a giraffe, six cows, and a goose. There are also three doves flying above the bed. How many legs are on the floor?

How many cubic feet of dirt are in a hole of one foot deep, three feet long, and two feet wide?

I have lakes with no water, mountains with no stone and cities with no buildings. What am I?