can any body tell me the secret inside this container

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an old lady walk into a grocery store she wanted to buy the best dog food in the world for her little puppy. she went up to the cash register to buy the food. the sales-lady told her that the store did not allow old ladies to buy animal food unless they show the actual animal becos a lot of old ladies like to eat the animal food themselves. so the old lady went home,got her dog and went back to the sore to buy her dog food. the next day she came back to by the best cat food around but the saleslady told her the same thing, so the old lady went back home and brought her cat to the grocery store buy the cat food. the nextday the old lady went to the grocery store again carrying a big container.she went up to the sales lady and said,"put your hand inside here".the saleslady shook her head."no",she said,"there is probably something in there that will bite me!""i promise you that there is nothing in here that will bit you".the old lady said.so the saleslady stuck her hand inside the container and screamed. can any body tell me wht is inside the container