Well, we learned a lot today. Not only did the bumper stickers themselves teach us a lesson or two, but most importantly, we also learned that you can in fact get great advice from the backs of people’s cars!

So keep your eyes peeled out there, because it looks like wisdom can come from places you least expect. Here are 15 bumper stickers that actually made us stop and think (or at least give a little chuckle on our way to the dentist).