What always comes into a house through the keyhole?

I am the fastest animal but cannot climb the tree. What am I?

John was driving a bus and got stuck when passing through an underpass. Then came Jacob with a needle and got the bus out of the underpass.

What did the boy do?

4 fathers, 2 grand-fathers and 4 sons went to watch the movie.What is the minimum number of tickets they need to buy ?

In front of you, there are 9 coins. They all look absolutely identical, but one of the coins is fake. However, you know that the fake coin is lighter than the rest, and in front of you is a balance scale. What is the least number of weightings you can use to find the counterfeit coin?

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

Can you solve the rebus below?

You need to complete the maze by entering from the entrance marked below in the figure near the yellow circle, bottom left and leaving from the exit point near the green circle, bottom middle.

Rule of Game: You can move only by exchanging green and yellow circles.

I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?

If all Goats are Sheep and all Sheep are Deers, are all Deers Goats ?