My GF received from her eldest daughter a pair of shoes for Christmas but she told me she had to give her daughter 10 pesos, as part of a superstition so she will not stamp on her daughter's feet with the new shoes! I guess the superstition is a bit metaphorical and means that the person receiving the gift will not overpower the one giving it, and she said it is the same for all presents related to feet (shoes, socks....)!!