Spotted outside a female toilet at Buona Vista. This picture was taken by a friend of mine. Let's not get too excited here, shall we? =)

Well, because if you take a look at the background of the picture, it's actually a renovation/construction site that was situated VERY near the female toilet. In this context, they could have been erecting (constructing) structures at the worksite. Most people however, relate erection to a certain bodily function, thus making this sign seem almost obscene. To prevent misunderstanding, perhaps a more suitable choice of words would be "CONSTRUCTION IN PROGRESS".

-Daniel =)