Alright, I need help identifying these

[cnsaguy]

What are these green "be" magnets in comic quotations I keep seeing on the backs of cars everywhere?

Google didn't help.

 

[fabknight]

IDK but I'm going to guess that it's probably promoting some bullshit PC type crap.

 

[CommuterBob]

probably the new YOLO or Keep Calm crap.

Look on the bright side, at least it isn't another rolling tombstone or stick family.