I haven't gotten very far into VII yet... but those bloody chocobos, right before Mithral Mines, absolutely REFUSED to stay in the fights, no matter how many greens I gave them.

Me: A chocobo! (Focuses attacks on one enemy while feeding Mimett Greens to chocobo.)
...
(About the time that enemy falls...)
Chocobo: Wark!!! (Runs away.)
Me: Son of a goomba.

(Process repeats approximately 15 times.)
Me: SCREW THIS!

And I'm not even going to TALK about Chocobuckle.