Ah, I remember one DM who had set up a good boss fight in a large room. The room had 2 pools, off to the sides, and the boss was a caster, with 2 ogre bodyguards that had bulettes on chain leashes. Our party was level 10-11. The Boss quickly hosed our barbarian with a simple Command spell, using the word "Swim". Poor dwarf barbarian in full plate had no ranks in swim, and failed his will save hard. He spent the next three rounds climbing his way out of the pool. Then he got hit with the exact same spell again, and again failed his save!
I was playing a sorcerer, and had taken out the bulettes quite quickly. Because I had a much better will save than the dwarf, the DM knew I would likely succeed on my save, so he instead had an ogre bull rush me into the other pool from the dwarf, and had the Boss blast it with Cone of Cold, freezing the surface. Luckily, I was able to hold my breath long enough for the rest of the party to win and get me out!
