3 Bullets

There was a woman who was heavily pregnant with triplets, and one day she was walking past a bank when a bank robber ran out and shot her 3 times in the stomach.
She was rushed into hospital and told that the triplets were fine and labour would go ahead as normal. So she had her triplets, two girls and a boy, and everything went fine for 16 years.
The woman was sitting in her living room and her daughter came in crying and the mother goes "Whats the matter?" and the daughter replies "I was having a wee and a bullet came out" so the mother tells her about the fateful day 16 years ago. The next day her other daughter does the same, comes in crying, was having a wee and a bullet came out, so the mother tells her the story too.
Then the next day the son comes in crying and the mother goes "Were you having a wee and a bullet came out too?" and the son replies "No, I was having a wank and I shot the dog"