Moms have a high tolerance for the gross and vile bodily functions of wee ones, but somehow we learn to deal better than most. Our male counterparts often gag at their first diaper change before they too adapt to dirty nappy duty. Mamas are known to scrape vomit off the car seat without batting an eye and wipe walls clean of uncontrollable diarrhea. Blood can make a mother queasy, as it is a sign of a physical injury while others can't stomach boogers or snot. What sends you over the edge?