[laugh on the wrong side of one's mouth]
or [laugh on the other side of one's mouth]
or [laugh out of the other side of one's mouth]
{v. phr.}, {informal}
also [laugh on the wrong side of one's face]
To be made sorry; to feel annoyance or disappointment; cry.
* /Paul boasted that he was a good skater, but after he fell, he laughed out of the other side of his mouth./