My favorite part is that empty bottles are always allowed, regardless of size. So you can have a six-ounce bottle with two ounces of liquid in it, and an empty three-ounce bottle, and that violates the rules, but if you pour the contents if the first bottle into the second, it's suddenly allowed, even though you have all of the same materials as before: bottles, liquids, etc. Totally irrational.
Equally amusing - so long as a liquid is frozen, you can bring as much as you like in any size container, because now it's a solid.
I one brought through security the remains of a soft-drink with ice cubes, that I'd transferred into a bottle. They made me drain the liquid that had melted, but the ice-cubes themselves weren't a problem.
