I heard this joke yesterday. 
A man walks into a bar and has a chat with the bartender. "Hey mate, how's business?" "Oh, it's fine. How are you?" The man says, "Well... my neighbour is really annoying me with her singing. I've got to do something about it!" The bartender replies, "Hmmm... I know a man who can sort that out for you. Come back tomorrow and I'll introduce you to him."
The man walks in the next day and the bartender sees him. "Hey mate, meet Arty. [pointing to the man] Arty, this is the man who has the problem." Arty says, "Hello. I hear you have a problem with your neighbour. I'll sort it out for you." The man replies, "That would be great! How much is it going to cost me?" Arty says, "I'll do it for a pound." "A pound?!?" the man replies. "Yeah. Where can I find this neighbour?" "Oh, she works at Sainsbury's. She sits in the far right corner of the cafeteria every day at 1pm." "Great, ok." Arty says.
The day after, Arty walks to Sainbury's and goes to the cafeteria. He looks in the far right corner and sees four people. "Oh no!" he says to himself. "Who is it?" A few moments pass and he walks up to the table. He wraps his hands around the first person's neck and strangles her. He wraps his hands around the seconds person's neck and strangles her. He wraps his hands around the third person's neck and strangles her, and lastly, wraps his hands around the fourth person's neck and strangles her.
The following day the man walks back to the bar and on a table he sees a newspaper. On the newspaper the headline says, "Arty chokes four for a pound at Sainsbury's."

A man walks into a bar and has a chat with the bartender. "Hey mate, how's business?" "Oh, it's fine. How are you?" The man says, "Well... my neighbour is really annoying me with her singing. I've got to do something about it!" The bartender replies, "Hmmm... I know a man who can sort that out for you. Come back tomorrow and I'll introduce you to him."
The man walks in the next day and the bartender sees him. "Hey mate, meet Arty. [pointing to the man] Arty, this is the man who has the problem." Arty says, "Hello. I hear you have a problem with your neighbour. I'll sort it out for you." The man replies, "That would be great! How much is it going to cost me?" Arty says, "I'll do it for a pound." "A pound?!?" the man replies. "Yeah. Where can I find this neighbour?" "Oh, she works at Sainsbury's. She sits in the far right corner of the cafeteria every day at 1pm." "Great, ok." Arty says.
The day after, Arty walks to Sainbury's and goes to the cafeteria. He looks in the far right corner and sees four people. "Oh no!" he says to himself. "Who is it?" A few moments pass and he walks up to the table. He wraps his hands around the first person's neck and strangles her. He wraps his hands around the seconds person's neck and strangles her. He wraps his hands around the third person's neck and strangles her, and lastly, wraps his hands around the fourth person's neck and strangles her.
The following day the man walks back to the bar and on a table he sees a newspaper. On the newspaper the headline says, "Arty chokes four for a pound at Sainsbury's."