An old man was standing at a bus stop when a large chavvy woman with 2 kids walks over. The kids are misbehaving and she is screaming obscenities at them.
The old man says to her ''Are they twins?'', the chavvy women looks at him and shouts "No, they ain't twins. The oldest one's 9, and the other one's 7, why the hell would you think they're twins? Are you blind, or just bloody stupid?"
The old man casually replies, "I'm neither blind nor stupid, Madam. I just couldn't believe someone shagged you twice....