So because it's not grammatically correct it negates the meaning? News flash: it's not grammatically correct ON PURPOSE. To make it catchy and cute. Common sense tells you when you see it that rolls are going to be thrown.
Does it matter if its an advertisement or a warning sign? It tells you what's happening in the restaurant.
It is then your choice to go there or not. It's everywhere. Billboards, the road sign, across the top of the building, on the door.
While you think what I'm saying is nonsense, I disagree.
There is a thing called assumed risk.
I believe she willingly assumed the risk.
By the way, she never said she didn't know. She knew. So whose argument is nonsensical?