Puppycow
Penultimate Amazing
Myself, I would hesitate to use the term violence for eggs, milkshakes or coin tossing.
We don't know if the intent of the coin tossing was to hit the women, or if that actually happened anyway. Earlier I speculated that the coins possibly were intended to be symbolic of paying them to kiss. In that case, hitting them with the coins might not be the goal. We just don't know, and the women don't say that they were hit by coins.
Throwing any object at a person (a stranger) seems like a very provocative act to say the least. The sort of act that is likely to lead to violence at least.