Flashback to 1996:
"Jo's Completely Factual and Not At All Juvenile Guide for Americans Visiting Britain"
In this 'friendly' tourist guidebook by Jo Miller, the advice escalated from "innocent (but wrong)" to "will get you arrested and/or beaten up if you try it".
This is the most recent snapshot that I could find:
https://web.archive.org/web/20060212185312/http://www.jomiller.com:80/archives/2004/09/jos_guide_for_a.html
This Guide was floating around Usenet and the www in the mid 1990s, and I'm sure Jo is still proud of it.
- "I think not, you charlatan!"