Just how we are able to worship our ancestors, it should be possible to disrespect them. Outrageously so, even.
You know how the saying goes. When the ancestors be trippin, you be sippin and dippin.
So, in light of this, when standing in front of an altar, I should be able to take disrespectful emotes and wave those at the altar, who - upon facing this unbearable evil before them - can not but change the expression of their clown-ass mask that sits upon the altar from what it is now to an angry, then a lil angrier, then to the most disgusted and repulsed expression.
If you upset your ancestors this way, you will lose numen points each time you upset them, but you will gain an item that reads "biting the hand that feeds you" which can be used to reduce hunger by a bit and an exp event called "independence day".
