My father farted in McDonald's and I was so embarrassed because all my friends were there to eating a Big Mac?

Well my father took my and my friends out to McDonald's and he wrote all our orders down on a peace of paper and he got our food. When he returned he started grunting and clenching his bottom after that he then said "sorry son I gotta let it out" and he did a loud smelly fart. All my friends were laughing and I was embarrassed beyond belief and I felt like a piece of crap. Why do dads do this kind of crap?