its a joke because passing gas is natural, if it had been deadly, we'd all been dead by now. We pass gas daily whether we want to or not, without such an ability, we would probably release gas in an extreme way (blowing up, imploding, lesions in the body for releasing gas, etc). A lot of commercials play off of ignorance on the part of the consumers to get people to buy the most ridiculous stuff. The reason why I find this amusing is because commercials like Ditech say that people are smart. I have seen anything that proves that true because we human beings are emotional beings, when presented with something that might instill our preconcieved fears, we tend to look for something that would provide emotional solace. Look at how died commercials control dieters, how toy commercials enrapture children, etc.