If there are decals on vehicles that irk me more than "my family" stick figures, it's "Baby on Board" signs.
Every time I drive past a vehicle with "Baby on Board" or "Child on Board" sign I want to yell, "Why do you need that sign? Why?".
Some of the reasons I've been told range from stupid to arrogant.
The dumbest reason was that in case of an accident, emergency services will see the "Baby on Board" sign and check the rear seat for a child.