I went with a friend to buy a grey cotton sweatshirt. I bought one but when I got home I noticed a little rip in the left sleeve. I showed it to my friend who encouraged me to return it. Would you believe, when I got to the store, the salesperson said "I'm sorry. This isn't the sweatshirt you purchased. Our records indicate that the sweatshirt you bought was 80% rayon and polyester. We can't take back this cotton one." "I'm afraid you're wrong", said I, smiling at my friend, who had been with me through the whole affair. "I did indeed purchase a cotton sweatshirt." I pointed to my friend. "This is my material witness".

One day, a woman walks into a dentist's office and asks how much it will cost to extract wisdom teeth. "Eighty dollars," the dentist says. "That's a ridiculous amount!" the woman says. "Isn't there a cheaper way?" "Well," the dentist says, "if you don't use an anesthetic, I can knock the price down to $60." "That's still too expensive," replies the woman. "Okay," says the dentist. "If I save on anesthesia and simply rip the teeth out with a pair of pliers, I can knock the price down to $20." "Nope," moans the woman, "it's still too much." "Well," says the dentist, scratching his head, "if I let one of my students do it, I suppose I can knock the price down to $10." "Marvelous," says the woman. "May I book my mother-in-law for next Tuesday please?"