Why you should know: a number of reasons. My boss used to throw bologna slices at moving vehicles either as a prank or out of road rage. What made me think you should know is an incident that happened to a friend the other day where they saw an ex’s car following them. That could be a subtle way to mark dangerous cars to alert others of stalkers or other such dangerous people.
They don’t have the same sticking power though, unless maybe you mandolin them into thin slices…