Tilting works!! I'm 100% on this method so far.. the problem is when I go to the local QuickieMart and have like 30 nonwinning diet pepsis littered on the ground around me, carefully tilting the next candidate at 24.9 degrees, wiping condensation off the bottle, grumbling quietly under my breath, retilting, wiping, grumbling, then cursing loser bottles out soundly. Err... I've gotten some funny looks. I do put them all back, though.
Of course, with vending machines at work, I still get the chance to be delighted at winning a cap without cheating... Soon, my iPod will be just a little fatter. Nowhere near the 200, though!