First Eddie, trochee (as will be discussed a billion times before we are done) is an unaccented syllable followed by an accented syllable. After that it gets to be a pain.
Mark, you saw three different meters in the poem and the problem is that it COULD be scanned as such. It's almost impossible to write a poem that cannot be scanned multiple ways. Trochee is difficult for me as I don't commonly use it (that's going to change). One of the problems we face are words that can be scanned easily as a "spondee" which is two unaccented syllables. There are very few times when a spondee occurs legitimately, but oodles of opportunities for "sort of" spondees. Generally when two syllables sit next to each other without a clear cut accent on one or the other, different reader will accent different ways.
For example, in my first line- "poet". This word is pretty much always accented on the first syllable in English, but it's a rather noncommittal accenting. At the end of a line as I used it, the word is trochee without exception, but stick it in the middle of a line and some readers will see it differently (as a spondee perhaps). This then screws with the meter following. I'm betting Mark, that you saw "incongruity" as an iamb followed by an anapest. I wrote it as trochee using the word's strict accent structure, but you're absolutely correct that it could be (and probably should be) scanned in the previous fashion. Speaking the word quickly and naturally will lead to iamb/anapest.
But back to the first line. I find that two small words together ("is the") tend to lend themselves to a spondee which is how you scanned it anapestic.
Absolutely correct. That would then leave the iamb with a catalectic foot. The only other point I can make (and this isn't mine, but a perspective I read elsewhere) is that when we read a poetic line the first two syllables will give to us a rhythm that should be maintained unless we are forced to pronounce something incorrectly to maintain it. So if my first two syllables set a pace that causes me to pronounce "correct" on the first syllable (which I feel is incorrect) we are then forced to either scan it differently or decide the poet doesn't know jack.
Eddie, don't worry about the attack thing. I can't be insulted. And tetrameter means that I have four trochees in each line. That is IF one can scan this as trochee. As I said, this is tough for me and needs practice. I'm going to try to mess with this poem and make it clearly trochee.
wesley

I think Mark and Eddie's comments are valid though. Like I said, it's nigh impossible to write something that can't be scanned multiple ways. I never use trochaic meter, so for me to do this I had to over accent things as I read it aloud and even now I hear different things.
Cat, your only misstep was the "ity" in "incongruity". You marked it as a single unstressed syllable, but go back and look- you will find it is two syllables. This is why we have workshops, to try and figure out what we're looking at. For me, I'm looking at about twelve poems in trochee before I can relax with it.
wesley