The original poster (OP), user nexxluxx, shared the unsettling discovery on Reddit, explaining that she lives in a small, privately owned apartment building on a busy street where most tenants know each other. ..."I cannot really figure out why someone would do this because I doubt it was anyone who lives here," the OP wrote. Apparently, one of the units found some Vaseline smeared on the tailgate of their truck. While several Reddit users recalled similar pranks from childhood, others warned that the Vaseline might be a signal used to check if a tenant is away. With fears of escalating tensions in the community, calls to install surveillance equipment and enhance security have resurfaced.