I just learned a particular section of a new kata that Sensei thought would take me at least 2 classes; I have it down pretty well after 1. So I come home and immediately practice that section (any time I learn something new, I need to run through it right away at home, even if it's just a few times, that very same night--because for some reason, it's sometimes hard for me to transfer the moves from the dojo to my own living room floor). Anyway, I'm spinning around, looking very karate-like, nailing these 180-degree turns...until I back into and trip over my roommate's reclined Laz-E-Boy.
Ooh! I found this clip online. The gentleman here is actually in my direct lineage: he's my sensei's sensei's sensei's sensei (draw pictures if you have to). I actually recommend watching this with the sound OFF, as he does this breathing thing that may distract you (it's for focus and inner strength; we do it, too, but not nearly like that). Anyway, this will help you see what a "kata" is, first of all (this is the 2nd one I'm learning, to get to green belt). Beginning around :33 is the section I learned tonight (MUCH harder than it looks, FYI)--and :45-ish is where I had the run-in with the chair at home just now (literally, just now--it was so funny that I stopped practicing and came in here to tell all of you about it).
And FYI, here's the one I had to learn for my first promotion. Mind you, he's a master and again, it looks WAAAYYYYY easier when HE does it than it actually is (I'll still be working on this for years and years, although I know the basic steps), so you may not appreciate the amount of blood, sweat and tears that went into this...but here you go: