In the lobby toilets of the Welcome Plaza they had for years a sign in Thai and English at the wash hand basins, the English part of which read:
Staff must wash their genitals before leaving this area
Maybe about a decade ago they gave the toilets a facelift and the sign was removed.
However, a new sign appeared - which was still there in 2016 - which read:
Patrons must not vomit in the basins
Quite a place!