The trochaic inversion

[milo]

Hmmm….

“Mad Poseidon”
Also
“Bad Poseidon”

I would read that as 

MADpo SEI don and BADpo SEI don

both regular trochaic

To fix it, we just need an unaccented syllable before the SEI like so
 Mad fish Poseidon
Bad fish Poseidon

That give us a Trochaic inversion (although in this case because it is not in an IP line, you could argue it is a choriamb)

Bad fish Poseidon swimming to the shore

bam, 1 trochaic inversion

See if you can do a quatern

Thanks

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oh, one final note, and most don't notice it bu due to limitations of English candence, you will not speak either 3 stressed or 3 unstressed syllables in a row without artificially promoting or demoting one, regardless of what your mind may tell you is correct when analyzing the meter.

The first three words here come pretty close:
"or to take ARMS aGAINST a SEA of TROUBles,"

no, in this case, "Or" gets promoted. It can be difficult to mentally see it, but if you were to record yourself (especially if reading IP) you would note it is ORto take ARMS aGAINST aSEA ofTROUBle

THis is actually a great example of trochaic inversion (not sure if you just came up with this or not)

But truth is, it's hard to say any one word at the same amplitude as any other. If we're going to designate
every word as either stressed or unstressed, there's a lot of rounding up or down that needs to be done.
I guess we could be more accurate by assigning an amplitude level from zero to ten. But it's not just the amplitude,
it's the length as well. A longer syllable at amplitude five probably counts as having more stress than a short one
at amplitude seven. But there are so many other things that factor in to calculate stress. You could pronounce "blood"
and "bud" at the same amplitude level and in the same length of time, but the psychological weight of "blood" would
guarantee it a higher stress level. So yeah, assigning binary values is always an approximation.

All of these are good points and good discussion.

For this exercise, I was hoping to just focus on trochaic inversion.  Maybe I didn't pick great examples (though one is so famous it changed the print of the book as well as many other books).  If there were some examples you could provide of trochaic inversion that better illustrate the point, I would be happy to yield to those, I just grabbed the first few I saw and maybe could have researched better.

or

we could bang out a few of our own.