Railroad Crossing, look out for the cars. Can you spell that, without any R's ?

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?

What animal walks on four legs in the morning, two legs during the day, and three legs in the evening?

Oedipus, the king of Thebes, figured out the answer to the riddle:

Cristina leaves home and then she makes exactly 3 left turns and returns home where she found 2 girls wearing the mask.

Who are these two masked girls?

When it is alive we sing, when it is dead we clap our hands. What is it?

The first person saw the bridge step on it and crossed,
the second person saw the bridge did not step on it but crossed,
the third person did not see the bridge did not step on it but crossed.
Who are these people?

This is a classy optical illusion puzzle. What more you can find except bricks in the image below?

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

This is a famous paradox which has caused a great deal of argument and disbelief from many who cannot accept the correct answer. Four balls are placed in a hat. One is white, one is blue and the other two are red. The bag is shaken and someone draws two balls from the hat. He looks at the two balls and announces that at least one of them is red. What are the chances that the other ball he has drawn out is also red?

There was an aeroplane crash, every single person died, but two people survived. How is this possible?