Your laugh is of the sardonic kind.

The most completely lost of all days is that on which one has not laughed. [Fr., La plus perdue de toutes les journees est celle ou l'on n'a pas rit.]

Nothing is more silly than silly laughter. [Lat., Nam risu inepto res ineptior nulla est.]

A day without laughter is a day wasted.

Laughter need not be cut out of anything, since it improves everything.

Laugh till you weep. Weep till there’s nothing left but to laugh at your weeping. In the end it’s all one.