A man walks into a bar with a duck on his head. The bartender looks at him and says, "Hey, what's with the duck?"
The man replies, "Oh, this is my lucky duck. Whenever I have him on my head, I have good luck."
The bartender chuckles and says, "Well, I'll believe it when I see it. Let's test your theory. If you can make this duck lay a golden egg right here on the bar, I'll give you free drinks for a week."
The man agrees and takes the duck off his head, setting him on the bar. After a few minutes of awkward silence, the duck finally lays an egg. The bartender is amazed and hands the man a drink.
The man then puts the duck back on his head and orders another drink. The bartender can't believe his eyes and asks the man how he trained the duck to lay golden eggs.
The man replies, "Oh, it's easy. I just feed him a diet of goldfish crackers."