On Christmas Day or, in some households, on Christmas Eve, one puts the tió partly into the fireplace and orders it to defecate. The fire part of this tradition is no longer as widespread as it once was, since many modern homes do not have a fireplace. To make it defecate, one beats the tió with sticks, while singing various songs of Tió de Nadal.
The tradition says that before beating the tió all the kids have to leave the room and go to another place of the house to pray, asking for the tió to deliver a lot of presents. This makes the perfect excuse for the relatives to do the trick and put the presents under the blanket while the kids are praying.
A similar tradition exists in other places, such as the Cachafuòc or Soc de Nadal in Occitania