"Stupid knife rain!"
A glass storm was a severe weather event featuring, in addition to lightning and rain, knife-like shards of glass falling from the sky with enough force to impale anyone caught below.
In 2381, a glass storm interrupted a fight to the death between Beckett Mariner and Ma'ah on Sherbal V, forcing both to seek shelter. (LD: "The Inner Fight")
There is a real exoplanet that does rain glass, HD 189733b.