The funniest joke I've ever heard

Last Christmas, my wife and I were trying to conceive but, despite our best efforts, we were unsuccessful. I went to a clinic to see if the problem was on my end and the receptionist handed me a cup with a little paper lid and pointed to an adjacent room. I said "What... now? Here? I don't know... can't I take this home?" and she took the cup, gave me a different cup with a proper lid, and said "bring this back tomorrow. It's important that you return it as quickly as possible for the testing." I thanked her and took it home. Later that evening, I was in the bathroom trying to take care of business but I couldn't. I opened the bathroom door and saw my wife talking to her mother, her parents being in town for the holidays and staying with us, and I went "Psst... hey. Come here." She came over and into the bathroom and I shut the door. I explained the situation and asked for some assistance. She rolled her eyes, said "okay fine" and went to town. Did everything she could, but nothing. She looked at me and said "Hang on. I have an idea." and walked away. She came back a minute later WITH HER MOTHER IN TOW. I'm looking at her, her mom, her, her mom, and finally "What the hell is this?" to which her mother said "It's fine. She explained the situation and I don't mind helping, especially considering what you're trying to do!" Before I could say yes or no she had taken it in her hands and was absolutely leaning into it. Threw a towel over it at one point. But, no matter what I did, no matter what my wife did, no matter what my mother in law did... none of us could get the lid off of that jar!