Not as easy as it used to be

[rebbonk]

One day an elderly man decided that since he had never fathered any children that he would make a deposit to the local sperm bank. At the sperm bank a young doctor gave the man a jar and told him to go into the bathroom and put his deposit in it.

After what seemed like a long long time the young doctor began to worry about the elderly man so he went to the bathroom door and knocked and ask if he was all right. No answer came from beyond the door so the doctor opened the door finding the elderly man breathing hard and sweating.

The Dr. asks, "Are you OK sir!"

The elderly man replied, "Son, it is not as easy as it use to be. I have slapped it, spit on it and beat it on the wall. I even ran hot water on it, I ran cold water on it and I still can't

Spoiler:

get the lid off this jar!"