The pig is offended that these two dimwits are assuming it's animal-gender is a goose. So it sprouts out tiny ridiculous looking wings and begins to hover above the ground. The goo- pig was flying, slowly, the bar was filled with dumbfounded dropped jaws as those who used the statement, "When pigs fly" in vain, paid up.
When the fun was over the big sack of potential bacon falls ungracefully to the floor. Turns into the goose that it was assumed and oinks, waddling out of the bar.