Bit of background: Dad is 100% Irish and has the Irish gift of talking ad nauseum about anything and everything, to the point of shoving his opinions down your throat. At his age, it's easier to just let him talk than to try and gently correct or otherwise distract/change the topic, even if he is "talking out of his rear end" so to speak.
Dad had surgery to remove colorectal cancer a few weeks ago. Due to the location of the cancer, the size of the tumor, and the prior damage to the surrounding tissues from his radiation therapy, the surgeon ended up having to give him a permanent colostomy. This was a known possibility, but was not expected, and (white text for those who might find this icky) part of the procedure meant that his remaining rectal tissue was sewn together, closing his anus permanently
After we found out about the surgical outcome and saw Dad in ICU, my mother, my brother and I all went to my parents' condo. While they each had a glass of bourbon, we were sharing stories and jokes to help relieve some of our tension from the 10 hours in the waiting room that day.
After one of my brother's jokes about verbal faux pas Dad had made in years past, I blurted out "well, at least someone finally sewed his (not polite word for buttocks, beginning with an "A") shut."
Both mom and brother burst out laughing, nearly choking on their bourbon. We have not told Dad about my less than polite observation involving his medical status.