Only once, actually. Whitcomb's bomb WAS picked up by Covenant forces, and when that Covenant taskfoce orbited Onyx, some Engineers managed to detonate it. The second time I don't believe atucally happened- Cortana or some AI had discovered another Halo and reccomended a Nova Bomb.
Still trying to think of what my favorite Halo quote is, though.
I could never think of one individual quote, but each of the characters I have favorites for.
Curt had the best death line "Spartans never die"
Kelly wins for sarcastic quips "Why they so twitchy?"
I hated the arbiter and everything he stood for and said.
Every single thing to issue forth from Johnson's mouth was awesome.
Stacker is the man for on the spot humor, "WOAH! Closed casket for you!" and "All them years of braces for nothing!"
Oh, and the devilishly Scottish Regret in 3 with "How could I have known!"
Finally the random machine-gunner in 2 "Do you see this look!? IT'S TERROR!"
Oddly enough I am also modding Halo stuff into Fallout 3 as I type this. Just not enough boom for one's buck. Already got the Marine armor in, working on tweaking the ODST set too. Going well.
Halsey: "Spartans never die... if only that were true."
Jhonson: In Halo 2, as your about to take the bridge in Metropolis, I believe the level is, depending on what difficulty you're on, Jhonson will give a different speech. The one on Legendary is the best.
Grunt: Talking Grunt Easter Egg speech (Halo 1)
Elites: "Wort Wort Wort!"
Marine: "Tank beats EVERYTHING!"
Gravemind: "I shall ask, and you shall answer..."
Kat: "As for getting into space, we could always use one of the non-existant Sabers that was disregarded as rumor by three administrations, who's non-existant launch center is definately no on Reach, and that our newest member was DEFINATELY not a Pilot in."
Forge: "Put the lady down, and let's settle this: MAN TO FREAK!"
Cortanan: "Scanning... just.... dust and echoes. We did what we had to, right? We stopped the Covenant, not to mention the Flood. Halo. It's finished."
John-117: "No, I think it's just getting started."
Jhonson: "It takes more than a bunch of face-sucking aliens to take down Sergent A. J. Jhonson!"
Grunt: "It's the deamon!" *runs away*