This isn't a road sign perse but....
Since its springtime in Kansas, we have tons of thunderstorms and tornados. Last Thursday, our building safety team sent out an email warning us about the threat of tornados for that day and it had this pic attached to it:
Seriously, if there had been a tornado, we would have all died because this pic had us ROTFLMAO!!!!!!!!!!! WTF!?!?! Who thought of this?? LOLOLOL