Misuse of “stomach” can lead to some very entertaining sentences.
I bet you don’t see it often! 
Sorry, I’m mean. But I thought it was an interesting illustration of how these types of errors are often not caused by ignorance, but by an unthinking desire to use high status words (such as Latinate “stomach”) over low status ones (such as plain old Anglo-Saxon “belly”), and therefore also shows up in the speech and writing of people who do know better.
By the way, since I took the time to try to embarrass you, I thought I should also take the time to mention that the reason I knew to go looking for that post is that I have long found your posts interesting, informative and wise, and that consequently that post stuck in my mind as “something WhyNot posted” rather than “something generic poster 42365 posted”. 