Hot on the heels of Litter Lunatic came Telephone Tosser.

Ring ring
Hello.
Who's that? (foreign accent)
It's Connor.
Oh yea, James tell me about you. You like bit of fun.
Sorry, you must have the wrong number.
No, no. He tell me you like play with your wife while other people watch. (or maybe it was the other way round)
You've got the wrong number.
Hang up
Ring ring
Brian picks up
Hey Connor, why you cut me off?
You have got the wrong number.
Tell me name your wife I tell you if is wrong number.
I don't have a wife.
Can I come play with you?
No, and if you call me again I'll get the police to you.
What the police do with this?
Hang up
Ring 1471
The caller withheld their number (surprise, surprise)
Ring ring
Brian picks up
Hello.
Employs recommended nuisance caller procedure by remaining silent then hanging up
Ring ring
Brian picks up
Hello. (different voice but still a species of johnny foreigner)
Same tactic employed, no further calls.

I hope my mobile never rings while I'm in the lift.