I remember mischief night! Grew up in Hunterdon County, NJ in the 80s. My parents (and the rest of our neighborhood) wouldn’t let the kids use eggs or shaving cream since they were a PITA to clean up. We were only allowed to TP the trees.
I tried to explain this phenomenon to my husband, who grew up in a Philadelphia suburb. He never heard of it.
What town in Hunterdon? I used to visit relatives in Pittstown every summer. They owned Sky Manor back in the 60’s.