Random moment on Google Earth: I clicked on a photo of Takeshita-doori (major teen shopping street), and found the following banner:

イライラした人にからまれたら、
牛乳を飲ませてみよう。

More or less:

If you're getting hassled by an irritating person,
try making them drink milk.

I’m thinking that’s not going to help much. I can’t quite make out the kanji in their smaller banner in the background, but if it’s the same quality of advice, I think I’ll stick to pepper spray.