Maybe not the strangest but here are 2 from my vacation to London last month:

2 women walking past. One of them says:

“I talk a lot of shit, but my fart is bigger than my shit.”

Then in Covent Garden I met a very polite drug dealer:

Excuse me, do you need any weed or coke? No, well then have a very good evening.

Nice guy, big smile.

“a troubled, oil-rich former British colony with a history of political violence”

:D