Cristina was born in 1888. She just had her 30th birthday today how did that happen?

Your mother’s brother’s only brother-in-law is asleep on your couch. Who is asleep on your couch?

Which tank will fill first?

A girl was sitting in her hotel room when she heard a knock on the door. She opened the door and found that a man was standing outside.
The man said, "Oh! I am really sorry, I thought this was my room."
He then walked through the corridor to the elevator. The girl did not know the man. She closed her door and called security asking them to apprehend the man.
What made her suspicious of that man? He might have been genuinely mistaken.

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.

I don't get anymore wetter, no matter how much rain falls on me.

What is more useful when it is broken?

Which three-digit number, made of consecutive digits, like 567, is 2 less than a cube and 2 more than a square?

81 x 9 = 801. What must you do to make the this equation true?

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