When potty training works against you...

Z's been doing soccer on Saturday mornings with "soccertots" thru the city, he has a love-hate relationship with it, he loves the *idea* of soccer, LOVES to kick the ball, loves to play the games, but the first few weeks were hot, and I mean *really* hot people, like 110 hot, that he did not *love* so much.  We brought lots of ice cold water, snacks, took lots of breaks, but still, the child was unhappy with the heat.  And then he started manipulating us.. you recall that Z is potty train(ing/ed)?  Ahh, yes, he has learned if he says "potty" we jump and take him to the nearest potty, which, during soccer, is inside the air-conditioned rec center.  Yah, so now, every time he gets hot at soccer he says "potty", *insists* on being carried, and of course only mommy will do, so I trudge him, sweat pouring down my face, down my back, and from every sweat gland in my body, across the field, across the parking lot, into the rec center, and you know what oh-so-sneaky little Z says when we finally get to the potty?  "NO! no potty mommy!!"  You can imagine my frustration at this moment as I'm catching my breath and wiping my sweat from hauling my 30+ pound child in 110 heat as fast as possible to the potty.  The first few times he had me, I didn't realize what he was doing, so we trudged back (of course I had to carry him) to soccer, and 5 minutes later after running around a bit it was "potty!  need do potty mommy!", 3x of this a 45 minute soccer session and mommy wised up and got *really* frustrated.  In one of my obviously finer moments as a parent after *just* having returned from a fake potty trip and he requested again, I shouted, loud enough for all the other soccer parents to hear, "no! we JUST went!!  You'll have to piss yourself if you really have to go!"  yah.. I'll obviously win mother-of-the-year for that one, and true to dramatic form, my child threw himself down on the ground and screamed "potty mommy!!" at the top of his lungs.  *sigh*.  Thankfully the weather is cooling off so the excuses should be getting more minimal, and this session of soccer is almost over, hopefully  next time the field is a lot closer to the potty :p, and we'll come prepared with pullups and towels for when he's not the little boy who cried potty, and actually has to go.