Is it normal that this happened at a recent family function?

Recently we had a nice extended family get together, between my family and in-laws, who I have a very nice relationship with. We spared no expense in hiring White Castle to do the catering. Now towards the end of the night, as the gathering was winding down it seems a small fight broke out between my own mother and mother-in-law over who would get the last White Castle burger. Being the gracious and generous host I am (and because my own mother tends to be a raging fatass), I decided that my mother-in-law should have it. Now my own mother was not happy at all with this decision, I could tell by the look on her face. She politely excused herself to use the bathroom and then thanked me for a nice evening and left. Some time I later I discovered that with every flush of the toilet fecal matter was being deposited in the bowl instead of being disposed of. Upon opening the tank I noticed several logs of feces and assorted other colonic expulsions. Is it normal to think my own mother in her anger at being denied the burger left me an "upper decker" in vengeance for this perceived slight?

Should I return the favor at the earliest opportunity?