What is the best joke, u ever heard ?

A blonde made several attempts to sell her old car. She was having a lot of problems finding a buyer because the car had 340,000 miles on it. She discussed her problem with a brunette that she worked with at a bar. The brunette suggested, "There may be a chance to sell that car easier, but it's not going to be legal." "That doesn't matter at all," replied the blonde. "All that matters it that I am able to sell this car." "Alright," replied the brunette. In a quiet voice, she told the blonde: "Here is the address of a friend of mine. He owns a car repair shop around here. Tell him I sent you, and he will turn the counter back on your car to 40,000 miles. Then it shouldn't be a problem to sell your car." The following weekend, the blonde took a trip to the mechanic on the brunette's advice. About one month after that, the brunette saw the blonde and asked, "Did you sell your car?" "No!" replied the blonde. "Why should I? It only has 40,000 miles on it."

One Sunday morning Joe burst into the living room and said, "Dad, Mom, I have some great news for you! I am getting married to the most beautiful girl in town. She lives a block away and her name is Susan. After dinner, Joe's dad took him aside, "Son, I have to talk with you. Your mother and I have been married 30 years. She's a wonderful wife but she has never offered much excitement in the bedroom, so I used to fool around with women a lot. Susan is actually your half-sister, and I'm afraid you can't marry her." Joe was heart-broken. After eight months he eventually started dating girls again. A year later he came home and very proudly announced, "Dianne said yes! We are getting married in June." Again his father insisted on another private conversation and broke the sad news. "Diane is your half-sister too, Joe, I am very sorry about this." Joe was furious! He finally decided to go to his mother with the news. "Dad has done so much harm. I guess I am never going to get married", he complained. "Every time I fall in love, Dad tells me the girl is my half-sister." His mother just shook her head. "Don't pay any attention to what he says, dear. He's not really your father."