Imagine swelling up to your limit, the pressure inside you indicating you're gonna pop at any given moment. You brace yourself for the bang but it doesn't come. You just start slowly inflating again, your belly/body slowly gaining inch after inch, going past your limit but still feeling like you're gonna pop at any moment. Being unsure if this bit of air/liquid will make you forcefully gain another inch or if you'll finally pop and relieve all the pressure inside.