Chameleons aren't kids, they don't like "playing" in water. Please don't anyone try to recreate this. This is just a good example of how tough chameleons really are when basic needs are met even when subjected to stressful situations. I'm sorry if that's harsh, but it's important that people don't think that it's an acceptable method of husbandry.
Here's a tip for misting. A lot of chameleons don't like getting sprayed with water directly and abruptly. I don't like the cheap small spray bottles. Get a hand held pressurized mister like this:
http://www.amazon.com/Chapin-20000-..._sim_lg_3?ie=UTF8&refRID=0MV0Z1A3QTSC04VJ3VZF
It's still cheap and produces a fine mist.
The key is to start with a fine mist on a nearby plant or surface without directly hitting the chameleon. Slowly move the mist towards the chameleon allowing some water to indirectly land on it. After a few seconds of this the chameleon will usually recognize it is "raining" and usually start to drink and clean it's eyes. Just remember to go slow and gentle with the mist.