“I lube my gun with liberal tears” is a common phrase seen on tasteless decals and shirts. There is actually a brand called Liberal Tears Gun Oil.

Well Yi-Fei Chen made a gun that collects one’s tears, freezes them and shoots the frozen projectile. I question the purpose of this since Mythbusters debunked the whole “frozen bullet” myth and that an ice projectile is not feasible. So collecting one’s tears, freezing it and shooting it is a futile effort

From the video it looks like a simple CO2 powered pistol with an added freezing chamber to freeze the tear solid.

This might come in handy when exposed to tear gas and then you will have an endless supply of ammo. LOL