I was picking up an order of green curry for the missus from the local Thai place and I noticed there were numbers written here and there around the restaurant. Like, in the windows, mirrors, menu board, walls, etc. I think I saw them in about 6-7 places. Four digit numbers, not all the same.
I asked the woman who rang me up about it. She just gave a slight smile, said, "Lucky numbers," and walked back into the kitchen.