I don't speak English

There've been a few times during this trip when I realized that I actually don't speak English. Or at least don't understand English. Or maybe it's just that I don't understand Yorkshire English, aka "northern"

Case in point today: Walking down the "shopping" street, buying some stuff for the trip to Nepal. Walk past a parked white van with a guy and a girl sitting in it. Motions me to come over - I figure he's lost and wants to ask for directions
guy: blah blah chit-chat, where are you from?
me: from the states
guy: mumble mumble want mumble mumble?
me: huh?
guy: would you mumble buy mumble (gun??) mumble camcorder mumble mumble?

The girl in the passenger seat is starting to laugh

me (incredulous): you want me to buy a gun and a camcorder?
guy (very defensive): no mate, I don't sell guns
me: well, dude, I don't buy camcorders....
Meanwhile, the chick is laughing out loud, I say good bye and walk away.

I still don't know what that was all about. Guess I don't really speak English.