I found out recently that not everyone can make themselves burp. It's a simple thing if you know how to do it. You just swallow a little bit of air and then pull it back up before it makes it to your stomach. I didn't realize that people couldn't do that. I just assumed that most people chose not to do it because it's gross. But as gross a talent as self-induced burping is, it's quite useful at times. In fact, I'll go ahead and give you two scenarios where it's very helpful.
The first scenario is when you feel a burp in your chest that just won't come out. It's that one where you duck your chin to your chest and then stretch your neck to try to coax it out, but it just sits there like a lump of air that's caught next to your heart. Those of us blessed with the gift of self-induced burping can swallow air and send it down to the trapped air. Then they fuse together and shoot back up your esophagus. I call this one the "rescue burp" because it acts just like a rescue worker when someone is trapped in a well or a collapsed building.
The more impressive scenario is when you want to really gross out your wife. This one has a more personal meaning to me because I've employed it for great use in the past. What I'll do is start off by complaining about some stomach pain. And I'll tell my wife that I don't feel so good. And I'll start to get up from my seat and say, "Oh no." And then, right as I get up, I'll turn my head and release a giant self-induced burp that shakes the walls. But I'll also add a little groan to it. The resulting effect is a very realistic vomiting sound. It's quite convincing (my wife usually tries to jump out of the way of the impending splatter). It's only funny for a few moments though, because it's always followed by a nice little fight about pranking people and how mean it is to do that to one's spouse.