Most people have more than the average number of legs.
Prime numbers.
It’s a “Mitch Hedberg” type of statement. (“I used to do drugs. I still do, but I used to, too.”)
Arrrrgh! 
Should have listened to my brain instead of trying to over think it.
The Vatican has 5.9 popes per square mile.
I stole it from a SMBC on how to freak out mathematicians with a technically true statement.
At sea level on Earth, pure water boils at 100°C and freezes at 0°C.
Well, insects are a type of arthropod, so that’s an asymmetric comparison. But I can’t find a good cite for my claim. It could be I’m misremembering and it’s most animal species have wings. Beetles seem to be everywhere and are incredibly diverse.
It’s a joke. It’s based on the idea that there are large values of 2 and small values of 5, and this refers to imprecision in computer representations of numbers and the use of rounding.
Is there much more to know about this?
Yes, I deleted trees because of reflection I didn’t think it would fit because nobody treats “tree” like a single clade in the first place.
I’m just surprised that the edit didn’t show up in your quote—I thought Discourse did that.
Most animals are nematodes.
Most drivers believe that they are above average.
Nobody has ever died from the AIDS virus.
If you go faster than light you go backwards in time.
Humans didn’t evolve from apes.
There exists a woman such that if she is sterile the human race will die out.
Adam and Eve never met or knew (or “knew” each other)
I’m not talking about Adam and Eve, I’m talking about a woman alive today.
It comes from the strict sentential logic definition of “if then”.
Logically “If A then B” is equivalent to the statement that either A is false or B is True.
So if Mary is not sterile then statement “If Mary were sterile the human race would die out” is True
So so long as there exists a non-sterile woman a exists for which the statement “If that woman were sterile the human race would die out” is true
Of course if there are no non-sterile women exist the statement is still true since then the human race will die out and I can pick any woman to make the statement true.
Maybe discourse is intelligent enough to know that my comment wouldn’t make sense
with the edited version.
Yes, that’ll be it.
Yes.
Every substance is poisonous.
ISTM that like Mr.E’s statement about the boiling and freezing points of water, this doesn’t meet the OP’s criterion of being “deceptively and woefully incomplete”. The initial impression that the average person would get from that statement is in fact an accurate reflection of reality.
Compare that to a statement like “Most animals have wings”, which could initially mislead the hearer into thinking that it means that most mammals and reptiles have wings (since that’s the sort of creature we colloquially call an “animal”, as in “animals, birds, fish and insects”), which of course is false.
You need the additional awareness that “oh yeah, strictly speaking ‘animal’ means any organism in the kingdom Animalia and a lot of those have wings” to make that statement seem plausible.
And every substance is not poisonous.