[user104658]

Originally Posted by parmnion

What if it was your wife you through the milkshake over?

It would be far worse (morally) than throwing one over a stranger, in the same way that name-calling is a form of domestic abuse in a relationship that doesn't apply when you're talking to someone else, however in any scenario throwing a milkshake is blatantly not the same as an act of violence intended to cause actual physical harm.