I know this is horrible of me, my mother and my sister...but I still laugh every time I think of it! (And it says a lot about why we don't associate with our extended family a lot...)
My grandfather (my mother's father, who we will refer to as P) passed away in mid-May, so my mother, my father and I drove three hours from Smalltown to Bigtown to help my Aunt (S) get things taken care of, especially relating to the funeral. Also to be joining us were my Uncle (D), his wife (C), my sister (N) and her daughter (A), all of who were flying in from various locales to attend P's funeral. It was well-known how Uncle D absolutely despised P, and he had good reason - P was not a nice man. He was very rich and very rude, rarely having a nice word to say about anyone, even his own children (and he was especially rude to my mother.) So we were all shocked that Uncle D would deign to show up.
But he did, and he's the one who did the thing no one should really laugh at, but we did anyway.
After the graveside service, all of us were invited to help fill in P's grave (he was cremated, so it was a small grave, only needing to fit the urn), so after we'd all put a small shovelful of dirt in, Uncle D helped fill in the rest and put the sod piece on top. Then he proceeded to tamp the sod very firmly down, first with the shovel, then with his feet. It looked normal enough to someone who wasn't family, I suppose, but...
That's when dear mother leaned over to me and whispered, "Looks like he's making sure the b*****d is really dead and buried."
I cracked up, because that was exactly what I'd just been thinking. I swore he was about to start dancing on the grave! (He didn't. He behaved himself VERY admirably.) And when we told N after the service, she laughed just as hard.
I fully admit this is a horrible etiquette faux pas, and I shouldn't find it so funny. But every time I imagine Uncle D tamping that sod down, the giggles just take over...