I thought he was just trying to be funny the way many of us do, even on sometimes not so funny issues. And we are often inappropriately humorous here on FR.
Honestly, the story caught my attention, not because of the tragedy of a murder, but the oddness of having both Karaoke singing and someone named "Mr. Wonderful".
Having seen Monty Python and The Holy Grail, I knew the meaning of "Right Out". In the movie the lampooning the Knights of the Round Table, apparently, the number three had evil connotations in medieval times, so you weren't supposed to say it aloud. And counting to five would be "Right Out" because the Holy Hand Grenade would go off in your hand.
KNIGHTS: Run away! Run away!
TIM: Haw haw haw. Haw haw haw. Haw haw.
ARTHUR: Right. How many did we lose?
LAUNCELOT: Gawain...
GALAHAD: Ector
ARTHUR: And Bors. That's five.
GALAHAD: Three, sir.
ARTHUR: Three. Three. And we'd better not risk another frontal assault, that rabbit's dynamite.
ROBIN: Would it help to confuse it if we run away more?
ARTHUR: Oh, shut up and go and change your armor.
GALAHAD: Let us taunt it! It may become so cross that it will make a mistake.
ARTHUR: Like what?
GALAHAD: Well...
LANCELOT: Have we got bows?
ARTHUR: No
LANCELOT: We have the Holy Hand Grenade. ARTHUR: Yes, of course! The Holy Hand Grenade of Antioch! 'Tis one of the sacred relics Brother Maynard carries with him! Brother Maynard! Bring up the Holy Hand Grenade! [singing] How does it, uh... how does it work?
LANCELOT: I know not my liege.
ARTHUR: Consult the book of armaments.
MAYNARD: Armaments, Chapter Two, Verses Nine to Twenty-One.
BROTHER: "And Saint Atila raised the hand grenade up on high saying, 'Oh, Lord, bless this thy hand grenade that with it thou mayest blow thy enemies to tiny bits, in thy mercy.' And the Lord did grin, and people did feast upon the lambs, and sloths, and carp, and anchovies, and orangutans, and breakfast cereals, and fruit bats, and large --"
MAYNARD: Skip a bit, Brother.
BROTHER: "And the Lord spake, saying, 'First shalt thou take out the Holy Pin. Then, shalt thou count to three, no more, no less. Three shall be the number thou shalt count, and the number of the counting shall be three. Four shalt thou not count, nor either count thou two, excepting that thou then proceed to three. Five is right out! Once the number three, being the third number, be reached, then lobbest thou thy Holy Hand Grenade of Antioch towards thou foe, who being naughty in my sight, shall snuff it.'"
MAYNARD: Amen.
ALL: Amen.
ARTHUR: Right! One... two... five!
GALAHAD: Three sir.
ARTHUR: Three!
I was just honestly inquiring what he meant by that statement. Totally not familiar with British sayings/slang I guess. 8>)