Which is the smallest number that you can write using all the vowels exactly once?

One day, John and his friends were playing around. Jacob hit something with a Pin and it popped. John's dad came into the room that very moment, but he wasn't mad. In fact, he was smiling. What did Jacob hit?

Can you decipher the following common phrase?

T M C
A U O
H S M
W T E

A chess tournament is taking place on knock-out terms (the one who loses the match is out of the game).
(a) If 10 matches are played in total, how many players participated?
(b) If 20 players took part in the tournament, how many matches were played?

What has many keys but can’t open a single lock?

What will you call your mother's brother's brother-in-law?

Use the numbers 2, 3, 4 and 5 and the symbols + and = to make a true equation. Conditions: Each must be used exactly once and no other numbers or symbols can be used.

I am quite hot but become too cold if you remove the first two letters. What am I?

A man in a car saw a Golden Door, Silver Door and a Bronze Door. What door did he open first?

Most people think of me as money. But when they find me in the water, they won’t get any money out of me. What am I?