Legendary Tomato On Board

Back in the mid-1980's, drivers started putting those suction-cup-held yellow caution signs in their cars, especially those that said "Baby On Board."  From there, there were bunches of spin-off caution signs displayed in cars, things like "Mother-In-Law On Board," "Old Fart On Board," "Labrador Retriever On Board," "Persian Cat On Board," "Bored on Board," etc.  They really made me sick, but finally, like all fads, they thankfully faded away.  Lately however, the "Baby On Board," sign has made a reappearance, a resurgence in fact.  It didn't make sense to me back in the '80's and it doesn't make sense to me now.  What does it mean?  Drive cautiously because a baby is on board?  I am all in favor of babies, love 'em in fact, but shouldn't we always exercise caution when driving no matter who is on board?  If we put "Baby On Board" on a caution sign inside of a car does that mean if there is no baby or no sign, it is okay to drive like a nut?  No baby here, go ahead and crash into me?  No baby, ok to exceed the speed limit?  No baby, go through stop signs and red lights?  No baby, no insurance?  No baby, pedestrian beware?  It didn't make sense back then and doesn't make sense now.  I think when getting behind the wheel you must always use caution, obey the law, have respect for the vehicle you are driving and what it is capable of doing.
Unless, of course, you spot a caution sign in a car that says, "Legendary Tomato On Board," then drive even more carefully.  Hmmm, I have an idea.