Another test for "whether you've still got your marbles"...
Q. 1 How do you get a giraffe in the fridge?
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A: open the door, put the giraffe in, then shut the door.
Q.2 How do you get an elephant in the fridge?
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A: Open the door, get out the giraffe, put the elephant in, shut the door.
Q.3 The Lion, King of the Jungle, calls a conference. All the animals attend except one. Which one?
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A: the elephant - you left it in the fridge.
Q. 4 Someone who wants to attend the conference has to cross crocodile-infested waters to get there. How does he do it?
A. Swim across - all the animals are at the conference, including the crocodiles.... you didn't forget did you?