The lime jello is used by people who are getting colonoscopy, as it won’t interfere with the colon being scoped. Yes I have had one, and was told I could have that if I was hungry, since you can’t eat for a day before and have to take some god forsaken brew to clean out your bowels :( I suspect the senior in question had them for that purpose.
After 42 yrs of marriage, my wife and I communicate with dirty looks and grunts ! :)