My dad asked me if I could build a site for him. I tried, but ultimately didn't have the chops (I can customize Wordpress, but this was supposed to be from scratch and I didn't keep up when things like CSS came into being; old). I sent him to hire an outside party.

Here's the thing: he wanted his menus vertical on the left side. I told him that's not how it should be done; they should be at the top. But he was adamant. Later, he told me that his web consultant shop had also said the same. It's the only time he ever said, "you were right," about anything like in my entire life. Not that he was an asshole (though he really was when I was growing up). It's just not something he said. And no one can take that from me. I even called my mom and told her.