[EasySt]

OK, here’s the cliff notes version...

Oumuamua was long, flat and thin, unlike the cartoon rocky cigar shape
we’ve been shown as the artist depictions. It was much more reflective
on one side than the other. It accelerated away from the sun at the rate
a seriously outgassing comet would, if it had shed 10% of its mass in the
process, yet there was zero evidence of any outgassing or cometary tail
whatsoever.

We’ve seen only one other extra solar object that behaved in this fashion.
It was being accelerated by light pressure alone. It was tracked back and discovered to be a shiny booster shell for a lunar landing surveyor mission
that is presently accelerating right on out of the system. It was ours.
Man Made.

Oumuamua didn’t come from here, and it isn’t coming back, either.

The scientist suggests the possibility that Oumuamua was extra-terrestrial
shiny, thin, flat, space junk, and that we would not be being scientific in
dismissing that possibility out of hand.

~Easy

[MadMax, the Grinning Reaper]

#30. The oblong object was either a volcano plug sent into space from some distant planet or a giant space turd from some alien species who I would not want to meet. If we spot their outhouse, then we will know the truth because “The Truth Is Out There”!

[dinodino]

If Oumuamua was artificial, then I’d argue the most likely origin is terrestrial. Maybe it was an artifact of an early Soviet program or something like that.

[TimSkalaBim]

"The scientist suggests the possibility that Oumuamua was extra-terrestrial shiny, thin, flat, space junk, and that we would not be being scientific in dismissing that possibility out of hand."

Nor would his book sales proliferate should we dismiss the possibility, as just about everyone else has.