Fog clouds and water and air elementals should be immune to dying from drawbridges. (If the drawbridge is destroyed when they are over the moat, the water elemental should fall into the water but the other two can remain flying.)

Add YAFMs:

• Combat messages produced when you attack a hallucinogen-distorted fog cloud are replaced by “You attack thick air.”
• When you try to engrave when engulfed by a dust vortex: “You try to write in the dust, but it won’t stand still!”
• When you get out of an air elemental (that you didn’t kill) while hallucinating: “I don’t think we’re in Kansas anymore.”
• When you attempt to move into a Mordor orc with the m prefix: “You fail to simply walk into the Mordor orc.”
• When a sasquatch is blinded by a camera flash: “Unfortunately, that picture’s probably going to come out blurry.”

Air elementals drop some rocks (and “sticks” - the occasional wand of nothing?) which is the debris you have been pummeled with. (Also makes the Plane of Air a little less difficult to cross if you haven’t got a levitation source.)

Kicking a sink may produce an air elemental.