Sure, there’s no crying over spilled milk.
But I’m more concerned about crying over spilled Plutonium.
That’s assuming that your eyes haven’t already bled out of their sockets, or you aren’t dead from the radiation sickness.
I’d suggest not crying over spilled Sulfuric or Hydrofluoric acid, either.
You’ll choke on the fumes and die, or your skin will begin to peel off in sheets.
Crying over pure Sodium will cause it to spark and flash, if it isn’t already catching fire.
So, if you’re going to cry, do me a favor and get the fuck out of my Chemistry lab.