Went to my local college town coffee shop and noticed one of their bathroom sinks was running continuously. I used my dad knowledge to figure out it was the hot side stem leaking and shut the hot water supply valve off, so the sink works now they just don't have hot water. I explained the problem to all the teenage baristas and felt very competent and smart.
I can only assume that you are posting this from the checkout line at Home Depot where you found the correct o-ring for the valve cartridge and are going back to finish the job.
I'm mostly kidding, that's pretty advanced levels of Dad insandiness.
I'm referring to "dad" as a character archetype here, same way people use "dad bob" or "dad rock". Obviously it's not knowledge exclusive to fathers, also I am not, nor ever intend to be, a father myself.
It's more that the experience made me feel like a stereotypical dad since I was explaining how to fix shit to younger people.