You all know the old

lateral thinking puzzles, where somebody comes with a situation, and then people ask questions that is answered by yes, no or irrelevant. Like, for example, the story of the man that is found in the middle of the field, dead and clutching a broken match. What has happened?

(the answer is that the man was in a sinking balloon and drew the short straw on who had to jump out to save everyone else)

This is not what this thread is about. It is, however, similar. In the normal puzzle games, questions are asked. In this thread, a situation is described, and you are all going to come up with a way that this could have happened. Points are given to people who come up with simple and amusing solutions, and if the case is a standard lateral thinking puzzle, the standard answer is not applicable.

After some time, really just chosen by the forumer who proposed the situation, this person picks the answer he finds the best, using its simplicity and amusingness and other criteria. The person picked comes up with a new situation. If the winner does not come up with a new situation within 24 hours of having been declared a winner, it's free for all to post a new situation until a situation has been posted. The first situation posted in such a case will be the new one.

Example:

Situation: Every day, a man takes the elevator down from his apartment in the 20th story of a tall building. When he comes home, he takes the elevator up to the 17th floor, and walks the last 3 floors up to his apartment, except when it's raining, in which case he will take the elevator all the way up. Why is this?

(standard answer: He's a short person, and can't reach the elevator button. However, when it's raining, he has his umbrella)

Possible solution: He takes the last few stairs as excersise. However, these stairs are on the outside of the building, and so whenever it's raining, he just takes the elevator all the way up.

Okay, so, here's the first situation:

**One day Kerry celebrated her birthday. Two days later her older twin brother, Terry, celebrated his birthday. How come?**(pretty classical one)