The simplest response to the original posting is to say to either guardian 'If I were to ask you which door to go through, what would you say?' and then go through that door. Work it out!

Even shorter crossword clue: E (13)

The one that always gets me:

Three people have a meal in a restaurant and get a bill for £30.00. They decide to split it evenly and so pay £10.00 each. The waiter takes the money but when he adds the bill up on the register realises that it actually only comes to £25.00. He takes 5 £1 coins from the till, puts 2 in his pocket, tells the customers that he made a mistake and gives them each £1.00 back.

They have now paid £9.00 each. As there are three of them this means they have paid a total of £27.00. The waiter has £2.00 in his pocket, making £29.00. Where's the other quid gone?

Duh!