Answer:
If a rooster lays an egg on the exact peak of a barn, which side does it fall?
What is yours but only used by others?
What is the building that you leave without ever having entered.
There are 20 birds in a tree. A man comes and shoots one of the birds. How many birds are left?
Mary gets in the shower, but surprisingly her hair is not wet when she gets out. How is this possible?
What has wheels and flies but is not an aircraft?