I went to a juice stand that was displaying something that looked like
agave leaves.  I asked the lady, "What do you call those?"
"Sabila"
"Can I get some juice?"
She pulled out a glass and poured in a bit of dark liquid from a
pitcher.  Then, she tipped a cup over my glass and slopped in what
looked like frogspawn, but must have been the Sabila squeezings.  It
was incredibly slimy and stretchy, and she used a knife to cut it when
she'd poured enough in.  She then added honey, some other exciting
liquids, some spices, and a dash of these unidentifiable, yet festive,
multicolored balls or seeds, which promptly sunk to the depths of the
concoction.
   She then poured the drink back and forth between two cups, I
suppose to mix it.  I kept track of the ball of slime, secretly hoping
that it was just there for flavoring, and it wouldn't end up in the
final drink.  
   Finally, she poured a glass and handed it to be.  My hopes sank as
I noticed the slime lurking in the depths.  "Aha!" I thought, "I'll
use my lips as a squeegee, and just sip the liquid.  The slime can
stay in the glass until I'm done, and later return to the depths from
which it came."  Under the senora's watchful eye, I raised the glass
to my lips and took a sip.
   This is where things started to go wrong.  Despite my attempts at
filtration, I felt some slime slide into my mouth.  I tried to
partition the damages and push it to a corner of my mouth, where I
could deal with it later in a civilized manner, but to my dismay, I
felt it slip down my throat.  With growing consternation, I attempted
to triage the situation and cut off the slime in my mouth from from
the rest of the slime in the glass using my teeth.  Now, I would like
to emphasize that there would be nothing wrong with the situation if
the slime hadn't been so sticky.  I was now faced with the
unprecedented situation of having a rope of slime reaching from the
glass in my hand down to my stomach.  To make matters worse, I was
unable to bit through the slime, and so I couldn't lower the glass
from my lips.  
"Well," I thought, "International relations be damned," and with my
free hand began pulling the slime from my mouth.  Have you ever seen
that magic trick where a magic pulls this infinitely long string of
crepe paper from his mouth?  That's not magic, darlin.  That's slime.
Pull as I might, the slime only stretched.  At this point, the juice
lady noticed my difficulty and sais "you were supposed to dirnk it all
in one gulp.  One fell swoop.  Didn't you know?"  I glared at her
silently as I pulled slime hand over fist from my mouth.  A woman in
the next stall noticed my difficulties and asked the juice lady
"What's his problem?"
"Oh, he didn't know to gulp the Sabila."
Both women nodded sagely.  
Meanwhile, I had managed to extract most of the slime and throw it in
a quivering mass on the ground.

"I'm sorry," I said, trying to smite the juice lady with fire from my
eyes, "I had no way of knowing I was supposed to gulp."

There was still liquid in my glass, which I eyed suspiciously, but
seeing no trace of the treacherous slime, I sipped tentatively, and
then drank the rest.  It was actually pretty good.  I handed my glass
back to the woman and shouldered my pack to head off, only to see her
holding out a pitcher to me.

                      "Don't you want the rest?"