Modern definition of irony - Irony is a situation, literary technique, or rhetorical device, in which there is an incongruity, discordance, or unintended connection with truth, that goes strikingly beyond the most simple and evident meaning of words or actions.
Classical (real) irony - the OPPOSITE of what is expected happens, not just something different
Sedna uses silence, it would be ironic if everything got louder
Nowadays, silence doing anything other than what you would expect is considered ironic, which is just plain stupid. It's a dumbing down of wordplay, and Benjamin Franklin would frown upon your shenanigans.