>
> Two blonde girls were working for the city
> public works department. One would dig a hole and the
> other would follow behind her and fill the hole in.
> They worked up one side of the street, then down the
> other, then moved on to the next street, working furiously
> all day without rest, one girl digging a hole,
> the other girl filling it in again.
>
>  An onlooker was amazed at their hard work,
> but couldn't understand what they were doing. So he
> asked the hole digger, 'I'm impressed by the
> effort you two are putting in to your work, but I
> don't get it -- why do you dig a hole,
> only to have your partner follow behind and fill
> it up again?'
>
>  The hole digger wiped her brow and sighed,
> 'Well, I suppose it probably looks odd because
> we're normally a three-person team.  But today
> the girl who plants the trees called in
> sick. 
>