"Of tongue or pen the saddest word..." The Saddest Words

Of tongue or pen the saddest word:
"It might have been"? Don't be absurd.
Some say the saddest, without doubt,
are, "Sorry, son; thy time's run out."
Still sadder some see, writ or spoke:
"Hey! Whassa matta? Jus' a joke."
Who hears these phrases owns he's failed:
"She's split, yer bird. Yer ship? She's sailed."
"Abandons hope, who enters here!" 
The saddest? Nope! (Though mighty near.)
More sad by far these triste terms be:
"As thou art now, so once were we."
The Virgin to God's Son doth whine
in John, chap. II: "They have no wine."
Still, THE most sad of all, I fear?
The barkeep's call: "We're outta beer."