Ok heres a good 1,

theres a women she lives on the top floor of a 18 floor apartment block,

Everyday she leaves for work at 8 am goes in the elevator down to the ground and on the way to work.

BUT

On the way home she gest the Elevator to the 11th floor and walks the rest. UNLESS its raining, if its raining she gets the elevator to her floor (top floor).

WHY????????