I hadn't really had any moments where my Pokemon flinched at a really disadvantageous time, until at least a few nights ago.
I had entered the PWT on White 2 for the first time since the mandatory tournament you do earlier on in the story. I ended up making it to the finals against Burgh in the rented Pokemon tournament, and we were both down to our final Pokemon. I can't remember exactly which one he was using, but I knew my Stunfisk would be able to two-hit KO it as long as nothing happened. I got off my first move just fine, but right before I got off my second, his Pokemon made my Stunfisk flinch. I was really disappointed with how things went down, especially since I expected the tournament to be a walk in the park.