In Thailand and Buddhist countries , it is offensive to point your foot, with or without a shoe , toward another person. Speaking of feet, step carefully over the low sill at temple doorways because good spirits are believed to live under the sill. They probably don´t like the noise. Remove ones shoes before entering homes or temples if you see others do the same. I love this tradition or rule or whatever the reason is. It lets me feel more connected to the people and culture somehow. Or at the very least, gives that hot spot on the side of my little toe a rest from the constant rub of the shoe.