I suspect this could be one of those things that EVERYONE else in the world knows - except me. But I have no shame and I will, finally, ask:
What's up with that very stylized cartoonish smiling cow face that shows up on every Vietnamese restaurant - or at least, almost every. At first I thought - oh, well, it's a chain of some sort. But then I realized that the places that used the cow on its sign were most likely not connected in any way. Am I wrong? Crazy? Really really dumb?