Re: the spaceman burp in a tweet; Apollo Astronaut (and mission Cdr) Walter Schirra got a head cold while in space and disobeyed orders to put his helmet on for re-entry, because he didn't want to sneeze in his helmet; it basically cost him his space career, but he became a Sudafed (which he took for his cold while in space) ad-man, carrying his helmet in the commercials and saying "Ever sneeze in one of these?"